introduction to computers prepared by aa

8/7/2019 Introduction to Computers Prepared by Aa

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Key Notes: Foundation of Computer Literacy

INTRODUCTION TO COMPUTERSComputers have become an integral part of our life and society, their applications ranging frombusiness transactions to personal communications. However, while many people use computers forwork and pleasure every day, few have a basic understanding of how computers work.

This unit presents a brief introduction to computers, focusing on what a computer is, how they areorganized and what they can do. The knowledge gained from this unit, viz., Introduction to computers,should provide a framework for understanding the basic computer concepts, as well as make you abetter consumer of computer technology. We will look at Windows basics(Here I will be talkingabout Windows XP ) and also on how to work with files and folders in Windows Explorer in thecoming chapters.What is a computer?In simple terms, a computer is an electronic machine capable of performing various arithmetic andlogical operations. The computer is also capable of storing information, which can be used later.A computer can process millions of instructions in a few seconds with high accuracy. Hence acomputer can be defined as an automatic electronic machine for performing calculations or controllingoperations that are expressible in numerical or logical terms. Computers are very accurate and savetime by performing the assigned task very fast. Moreover, unlike human beings,they never get bored.It is the ability to take instructions in the form of programs and execute them, that distinguishes acomputer from a mechanical calculator. While both are able to make computations, a calculatorresponds simply to immediate input. In fact, most modern calculators are actually computers, with anumber of pre-installed programs to help in complex tasks.Computers accept instructions and data, perform arithmetic and logical operations and produceinformation. The data fed into the computer is converted into information through processing.

The first electronic computers were developed in the mid-20th century. These were very huge in size.,say, the size of a large room, consuming as much power as several hundred modern personalcomputers (PCs). Modern computers based on integrated circuits are billions of times more capablethan the early machines, and occupy a fraction of the space.

The computer has completely changed the way we do our job or organisations operate theirbusinesses. Together with this reason and many more, computers are considered more than just anessential piece of fancy equipment. Whether we know or not, we are forced to use computers in ourday to day lives, for doing bank transactions, doing online shopping and many more.Applications of ComputersComputers are used almost in every sphere of human life including government, industries, medicine,education, law, research, arts and media. Its application is limited only by our imagination.

There are so many applications of computers, that it is impractical to mention all of them. This is theComputer Age and these machines are impacting our lives in many ways. Computers are nowbecoming faster, more reliable and effective than they had been ever before.RetailingProducts from meats to magazines are packed with zebra-striped bar codes that can be read by thecomputer scanners at supermarket checkout stands to determine prices and help manage inventory.

Thus, a detailed receipt of the groceries can be made, which is useful for both the customer and theretail store, especially for the stock control system. This is referred as POS (Point of Sale) transactionwhere a precise account of all the stocks available is recorded and manipulated.

Health and MedicineComputers are helping immensely to monitor thee extremely ill in the intensive care unit and provide

cross-sectional views of the body. This eliminates the need for hired nurses to watch the patienttwenty-four hours a day, which is greatly tiring and error prone. Doctors use computers to assist themin diagnosing certain diseases of the sort. This type of computer is called the Expert System, which isbasically a collection of accumulated expertise in a specific area of field. Computers are now able tomap, in exquisite detail, the structure of the human cold virus - the first step towards the commoncold. Furthermore, computers are used greatly in managing patients, doctors, wards and medicinerecords, as well as deal with making appointments, scheduling surgeries and other likes.Agriculture

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Farmers use small computers to help with billing, crop information, and cost per acre, and market pricechecking. Cattle ranchers can also use computers for information about livestock breeding andperformance.TrainingIt is much more cheaper and effective to teach pilots how to fly in a computerised cockpit orsimulators, than in real airplanes. This is because the learning pilots will feel much more relaxed andconfident due to the fact that no life is at risk at that moment. Railway engineers can also be giventraining on how to run a train with the help of a computerised system. Training simulations arerelatively cheaper and are always available on one-to-one basis making way for personal training.Computers are all around us and avoiding them is virtually impossible. We have been exposed in theworld of computer advertisements and computer headlines. We interact with computers in our dailylives - whether we are at the cinemas, the school, or the public library.Hardware and SoftwareA computer system has two major components, hardware and software.HardwareHardware refers to all the physical components associated with a computer. The most important is thecentral processing unit (CPU) or microprocessor. It is the 'brain' of the computer as it does all thecalculations and processing. Other hardware devices are monitor, keyboard, mouse, printer, hard disketc.SoftwareSoftware is a set of instructions/programs, which enables the computer to perform a specific task. Animportant software called the 'Operating System' is a set of specialized programs which manage theoverall operations of the computer. Windows XP is a well-known and widely used operating system.

There are other types of software too, known as the application software which are intended to beused for specific tasks such as word processing etc.

TYPES OF COMPUTERSComputers can be classified based on their principles of operation or on their configuration. Byconfiguration, we mean the size, speed of doing computation and storage capacity of a computer.Types of Computers based on Principles of Operation

There are three different types of computers according to the principles of operation. Those threetypes of computers are

Analog Computers Digital Computers

Hybrid Computers



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Analog ComputersAnalog Computer is a computing device that works on continuous range of values. The results given bythe analog computers will only be approximate since they deal with quantities that vary continuously.It generally deals with physical variables such as voltage, pressure, temperature, speed, etc.Digital ComputersOn the other hand a digital computer operates on digital data such as numbers. It uses binary numbersystem in which there are only two digits 0 and 1. Each one is called a bit.

The digital computer is designed using digital circuits in which there are two levels for an input oroutput signal. These two levels are known as logic 0 and logic 1. Digital Computers can give moreaccurate and faster results.Digital computer is well suited for solving complex problems in engineering and technology. Hencedigital computers have an increasing use in the field of design, research and data processing.Based on the purpose, Digital computers can be further classified as,

General Purpose Computers Special Purpose Computers

Special purpose computer is one that is built for a specific application. General purpose computers areused for any type of applications. They can store different programs and do the jobs as per theinstructions specified on those programs. Most of the computers that we see today, are generalpurpose computers.Hybrid ComputersA hybrid computer combines the desirable features of analog and digital computers. It is mostly usedfor automatic operations of complicated physical processes and machines. Now-a-days analog-to-digital and digital-to-analog converters are used for transforming the data into suitable form for eithertype of computation.For example, in hospitals ICU, analog devices might measure the patients temperature, bloodpressure and other vital signs. These measurements which are in analog might then be converted intonumbers and supplied to digital components in the system. These components are used to monitor thepatients vital sign and send signals if any abnormal readings are detected. Hybrid computers aremainly used for specialized tasks.Types of Computers based on Configuration

There are four different types of computers when we classify them based on their performance andcapacity. The four types are

Super Computers Mainframe Computers Mini Computers Micro Computers

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Super ComputersWhen we talk about types of computers, the first type that comes to our mind would be Supercomputers. They are the best in terms of processing capacity and also the most expensive ones.

These computers can process billions of instructions per second. Normally, they will be used forapplications which require intensive numerical computations such as stock analysis, weatherforecasting etc. Other uses of supercomputers are scientific simulations, (animated) graphics, fluiddynamic calculations, nuclear energy research, electronic design, and analysis of geological data (e.g.in petrochemical prospecting). Perhaps the best known super computer manufacturer is CrayResearch. Some of the "traditional" companies which produce super computersare Cray , IBM and Hewlett-Packard .As of July 2009, the IBM Roadrunner, located at Los Alamos National Laboratory, is the fastest supercomputer in the world.If you want to know more advanced details about super computers , refer to SuperComputersMainframe ComputersMainframe computers can also process data at very high speeds vi.e., hundreds of million instructionsper second and they are also quite expensive. Normally, they are used in banking, airlines andrailways etc for their applications.

Mini ComputersMini computers are lower to mainframe computers in terms of speed and storage capacity. They arealso less expensive than mainframe computers. Some of the features of mainframes will not beavailable in mini computers. Hence, their performance also will be less than that of mainframes.Micro Computers

The invention of microprocessor (single chip CPU) gave birth to the much cheaper micro computers. They are further classified into

Desktop Computers Laptop Computers Handheld Computers(PDAs)

Desktop Computers

Today the Desktop computers are the most popular computer systems.Thesedesktop computers are also known as personal computers or simply PCs. They areusually easier to use and more affordable. They are normally intended forindividual users for their word processing and other small applicationrequirements.

Laptop Computers

Laptop computers are portable computers. They are lightweight computers with athin screen. They are also called as notebook computers because of their small

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size. They can operate on batteries and hence are very popular with travellers. The screen folds downonto the keyboard when not in use.

Handheld Computers

Handheld computers or Personal Digital Assistants (PDAs) are pen-based and alsobattery-powered. They are small and can be carried anywhere. They use a pen likestylus and accept handwritten input directly on the screen. They are not aspowerful as desktops or laptops but they are used for schedulingappointments,storing addresses and playing games. They have touch screenswhich we use with a finger or a stylus.

PARTS OF A COMPUTERWe know that computer consists of various physical components known as hardware devices. Let usnow see about some of the basic parts of a computer system.

CPU(Central Processing Unit)

The central processing unit or the microprocessor is the core of the computer. Ithas the electronic circuitry to process the input data to get the requiredinformation. It is the processor which executes the instructions.Another component known as 'Random Access Memory'(RAM) resides insidethis unit and it stores the data that the CPU uses for processing. But this memory isvolatile which means that the data will be erased once the computer is switchedoff.

Mouse

A mouse is a small device used to point to and select items on your computerscreen.A mouse usually has two buttons: a primary button (usually the left button) and asecondary button. Many mice also have a wheel between the two buttons whichenables smooth scrolling.When you move the mouse with your hand, a pointer on your screen moves in thesame direction. When you want to select an item, you point to the item and then



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click (press and release) the primary button. Pointing and clicking with your mouse is the main way tointeract with your computer. We'll see more about using the mouse in a later chapter.

Keyboard

A keyboard is used for typing the text. Apart from letters and numbers, it hassome special keys too. The top row contains the 'function keys' for differentfunctions. On the right side of the keyboard, we see the 'Numeric

Keypad' which is used to enter numbers quickly. Arrow keys known as the 'Navigation Keys' allowseasy navigation through the page.

Monitor

A monitor displays the information for the user to view them. The informationcould be in text or graphical form. The area in which the information is displayed

is called the screen. There are basically two types of monitors viz., CRT Monitors and LCD Monitors. The LCD monitors are being widely used these days.

Storage

Disk Drives are storage devices that store information and preserves it even when the computer isswitched off.

Hard Disk

Hard Disk Drive stores information on a hard disk with a magnetic surface. It isnormally inside the system unit. In most of the systems, the hard disk acts as theprimary storage, storing almost all the program files and other data. Hard disks canstore massive amount of information depending upon their configuration.

CD/DVD Drive

Most of the computers today come with a CD/DVD Drive which is located on thefront side of the CPU Box. CD drives use lasers to read data from a CD, and if it isa writable CD drive, you can also write data onto CDs.DVD Drives are similar to CD Drive, except that the amount of data that a DVDcan hold is much much more than a CD.

Floppy Disk Drives



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Floppy disk drives store information on floppy disks. floppy disks can store only asmall amount of data. Moreover, they retrieve information very slowly and aremore prone to damage. For these reasons, floppy disk drives are less popular thanthey used to be once.

WINDOWS XPWe have so far been learning about computers in general. Now, let us start learning about animportant and popular operating system known as 'Windows XP'.In this chapter, let us see what is Windows XP and also some basic operations.What is Windows XP?Windows XP is a user-friendly operating system produced by Microsoft with a graphical userinterface(GUI) for use on desktop and notebook computers. XP stands for 'experience'.Windows XP is known for its improved stability and efficiency over the 9x versions of MicrosoftWindows. It is also the first version of Windows to use product activation to combat software piracy.Windows XP is available in many languages.Windows XP Editions

The most common editions of the operating system are Windows XP Home Edition, targeted at homeusers, and Windows XP Professional ,which has some additional features and targeted at powerusers, business and enterprise clients.Windows XP Media Center Edition has additional multimedia features enhancing the ability to recordand watch TV shows, view DVD movies, and listen to music.Windows XP Tablet PC Edition is designed to run ink-aware applications built using the Tablet PCplatform.

There is also Windows XP Embedded , a componentized version of the Windows XP Professional, andeditions for specific markets such as Windows XP Starter Edition.What is GUI?GUI is Graphical User Interface . Before we try to understand GUI, we must first see what is an

interface. An interface is a (logical) connection between two entities, in this case between the user andthe computer. It enables the user to interact with the computer.Before the introduction of GUI, most of the operating systems used Command Line Interface(CUI),which required the users to remember some cryptic commands and type them without any errors.With GUI, all the information is displayed on the screen with pictures and hence it is very easy for theusers to point and select the information that they want with the help of the mouse.New Features in XPWindows XP introduced many features which were not found in previous versions of Windows. Some of them are listed below.

Faster start-up and hibernation sequences The ability to discard a newer device driver in favor of the previous one (known as driverrollback), should a driver upgrade not produce desirable results More user-friendly interface, including the framework for developing themes for the desktopenvironment Fast user switching, which allows a user to save the current state and allow another user to logon without losing that information The ClearType font rendering mechanism, which is designed to improve text readability onLCD monitors Remote Desktop functionality, which allows users to connect to a computer running WindowsXP Pro from across a network and access their applications, files, printers, and devices Support for most DSL modems and wireless network connections.

System Requirements for XP The minimum hardware requirements for Windows XP Home/Professional Edition are:



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Pentium 233-megahertz (MHz) processor or faster (300 MHz is recommended) At least 64 megabytes (MB) of RAM (128 MB is recommended) At least 1.5 gigabytes (GB) of available space on the hard disk CD-ROM or DVD-ROM drive Keyboard and a Microsoft Mouse or some other compatible pointing device Video adapter and monitor with Super VGA (800 x 600)or higher resolution Sound card Speakers or headphones

USING THE MOUSE The mouse is an input device which is moved on a flat surface called the mouse pad.When we movethe mouse, a pointer called mouse pointer moves on the screen and it is used to point to things on thescreen. Normally, the mouse has 2 or 3 buttons on top.MoveMoving the mouse is nothing but dragging the mouse on the mouse pad so that the mouse pointermoves in the direction you want, without touching the buttons. This action allows you to point to thingson the screen.Click Clicking is used to select an object on the screen. To do this, first we need to make the pointer point tothat object and then press the left button once and release the button immediately.Double-Click Double-clicking is used to start the applications. It is the same as clicking but here, we need to pressthe left button twice in quick succession. It requires some practice for the new users.Click and Drag

This is used to move an object from one place to another. To do this, we need to hold the left buttondown and while holding it down, we need to move the mouse to the place we want.Right Click If you point to an item and click on the right button, you will be provided with a context sensitive

menu. This menu provides almost all the facilities offered by menu as well as toolbars. We will learnmore about this as and when it is required.

LOG IN/LOG OFF/SHUT DOWNLet us see how to log in to the computer, log off from the computer and shut down the computerproperly.Logging In

Turn on the computer. If you are the lone user, you will be taken to the Windows XP desktop directly. If there are multiple users, a welcome screen like the one displayed below will be shown with all the useraccounts. Here, our aim of logging in is to enter the Windows XP desktop.



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You can select your account by clicking on the appropriate username. Suppose you do not have apassword, you will be directly taken to the Windows XP desktop. Suppose you do have a password, anentry box appears for typing in the password. Password is case sensitive. Care must be taken to enterthe password using the appropriate case. If it is found to be correct, you will be taken to the XPdesktop.Logging Off Logging off is the process of closing the desktop and returning to the Log In screen.

To logoff from windows, follow the steps given below. Save all your unsaved work Click the Start Button. Click the Log off button.(Log Off is at the bottom of the Start menu) You will be shown Log off Windows. Click Log off button

Shut Down the Computer

Follow these steps, if you want to shut down the computer. Save all your unsaved work/documents Click the Start button. Click Turn Off Computer button. You will be shown Turn Off Computer window with 3 optionsalong with Cancel. If you have changed your mind not to shut down, then click Cancel . Otherwise, click Turn off button to shut down the computer. Suppose you have dual operating system and want to switch over to the other operatingsystem, then you can click Restart button.



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There is yet another Choice 'Stand By' . This action will save power. If you have Hibernatefacility, you can make use of it. Place the cursor on Stand By button and press Shift key,Stand Bywill change into Hibernate . If you click the Hibernate button and Switch off computer, thecomputer can be started comparatively quickly, in the next time, when you open the system.

DESKTOP AND TASKBARWhen you switch on the computer, Windows XP automatically starts loading from the Harddisk(provided it is your default operating system). While loading, it checks the memory and hardwarecomponents such as keyboard, disk drives etc. Once this is over, it starts loading files necessary forthe GUI interface, after which it displays a screen. This opening screen of Windows XP is calledthe Desktop .



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Desktop The basic working platform in Windows XP is the Desktop . It contains several Icons like My Computer,My Documents etc. These are some of the standard icons. Apart from these, you can also create iconsfor the applications that you use frequently and place them on the desktop.

The desktop also contains a Taskbar , which is a narrow strip, normally displayed at the bottom of thescreen. On the left, it has the Start button. When you click on the Start button, the Start menu appearson the left side of the screen. Using the Start menu, you can start any application that you haveinstalled in your computer.Next to the Start button is the Quick Launch Toolbar . This contains icons that allow you to selectsome commonly used internet-related applications. On the extreme right is the Systems Tray ,thatcontains the Clock and icons for other utilities. The space between the Quick Launch Toolbar and theSystems Tray is used to display buttons for the applications currently being used.

THE START MENU The Start menu is like a launch pad from which you can do most of the things you want to do withWindows XP. Using this menu, you can start applications, change the settings of your computer, find

files, get help etc. The Start menu appears when you click on the Start button on the taskbar. You can have two different Start menus, one is the usual Start menu and another one is ClassicStart menu .



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To select an option from this menu, just move the mouse pointer over the options, till the one that youwant is highlighted. Now, with the mouse, just click on the option which is highlighted.Can you see an arrow at the right of 'All Programs' on the Start menu? A right arrow indicates thepresence of one or more levels of submenu.



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To select an option on the submenu, move the mouse pointer sideways till one option on the submenugets highlighted. Now, move the mouse pointer up/down till the option that you want is highlightedand then click.

STARTING AN APPLICATION



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Starting an application can be done in many ways in XP. But there are two ways which are mostfrequently used.

Using icons on the desktop Using the Start Menu

Using icons on the DesktopIf you want to start an application, just see if its icon is available on the desktop. If it is available, just

double-click on it to start the application. This is the easiest way to start an application. If the icon isnot available on the desktop, you can create one. Normally, you may want to create a desktop shortcutfor the most frequently used applications. For creating a desktop shortcut, refer to Desktop ShortcutsUsing the Start menuIt is not possible to have icons for all the applications on the desktop. So, how do we start theapplications then? You can use the Start menu, to start applications, for which icons are not availableon the desktop. Click on the Start button on the taskbar and select the option that you want from anyone of the menus or submenus that appear.For example, to start the application 'Notepad' ,Click on the Start button, and then click on All Programs. Select Accessories from the submenu, andthen click on Notepad.

The above operation can be performed by keyboard operations also. Press Ctrl + Esc, or Window Key Press P , this will highlight All Programs Press the Enter key, submenu will be displayed. Press A and Enter . In the final submenu, press N .

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WINDOWS The rectangular area appearing on the desktop, when we start an application is called a window . Youcan have several windows on your desktop at the same time. These windows may be big or small.

They may be overlapping others or one beside the other.Parts of a Window

You can move the window around the desktop, change its size, hide it from your view and so on.

Let us start the Notepad application to learn these operations. Click on Start->All Programs->Accessories->Notepad.

The notepad application window opens.



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Windows XP is designed in such a way that all windows are similar. The methods used for resizing,moving and closing the window are the same for all windows.At the top of the window is the Title Bar . The title bar tells you the name of the application. There isan exception however; Windows Explorer will not show its name in the title bar. The tile baralso contains 3 sizing buttons, at the top right corner.Minimize Button :

This button is used to reduce the size of the window to a button on the taskbar. Minimizinga window does not close it; it simply hides it from you.

Maximize Button :

Click on this button to enlarge the window to fill the entire desktop.

Resize Button :



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This button is used to restore the window to its original size i.e., to the size before youmaximized it.

Close Button : This button is used to close a window. Closing a window will remove its contents frommemory and screen.

Menu Bar

Below the title bar is Menu Bar . This displays the various menus available to you. When you click on amenu option, say File, all the sub-options appear as a drop down menu. You can select any one of them by pointing to it with the mouse pointer and then clicking it.For example, to save a file, you can click on the File menu and select Save from the drop-down list. If you save the file for the first time, you may be prompted to enter the name of the file.Moving a WindowWhile working with multiple windows, you may face a situation wherein you need to move a window toa different location on the desktop. You can do so by clicking and dragging the title bar of the window.Please also note that you cannot drag a window when it is either maximized or minimized.Change the size of a WindowPoint to the window border with the mouse. The mouse pointer changes like a double-headed arrow.Click and drag this arrow to increase/decrease the size of the window. To change the length andbreadth simultaneously, move the mouse pointer to either of the bottom corners and do the aboveoperation.

CUSTOMIZING WINDOWS XPOne important feature of Windows XP is that it allows the users to customize their desktop. Let us seehow to do it?Customizing TaskbarPosition : You can move the taskbar to any of the four sides of the desktop, unless it is locked. To dothis, place the mouse pointer in an empty area on the taskbar. Then click and drag the taskbar to anyof the sides where you want it to be placed.Size : To change the size of the taskbar, point to the edge of the taskbar. Now the mouse pointer willchange into a double-headed arrow. Click and drag the mouse to increase/decrease the size of thetaskbar.Taskbar Settings : Right click on the empty area of the taskbar.

From the shortcut menu, Select toolbars to add/delete a toolbar like address, links etc.

You can arrange the windows the way you want with 'Cascade Windows' , 'Tile WindowsHorizontally' , 'Tile Windows Vertically' and 'Show Desktop' shows the Desktop. For moredetails see show desktop

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Click on Task Manager to see the various processes running and also to perform operationslike 'End Task' etc.

To make the Taskbar fixed, click on 'Lock the Taskbar' so that the taskbar cannot be moved.

Clicking on Properties will open the Taskbar and Start menu properties windows under the Taskbar tab. You can try selecting and deselecting the various options listed there to customize thetaskbar. Changing it into Start Menu tab will give you the option to change the start menu style. Forfurther details, see Classic Start Menu

Changing Wallpaper :Wallpaper is the background of your desktop. There are several wallpapers that come along with XP.

You can choose one among them or you can also use a picture of your own.Right click on the blank area of the desktop. A menu pops up.

Click on 'Properties' . The 'Display Properties' dialog box appears. Click on Desktop tab. It lookssimilar to the figure below.

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From the list of wallpapers, select the one you want. You can see a preview on the top half of thewindow. If you like it,click on Apply and then on OK .

Screen Savers :With the constantly improving technology, screen savers are nowadays used more as a fun rather thanfor a specific purpose. Click on Screen Saver tab in the Display Properties dialog box. Click on thedrop down list box just below the screen saver prompt. A list of available screensavers would appearas below.



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Select any one and a preview would appear at the top half of the window. Specify the time to waitbefore displaying the screen saver (in minutes) in the wait text box. According to the figure below, thecomputer would wait for 5 minutes before displaying the screen saver.

CONTROL PANEL BASICS The Control Panel is used to install and manage the different hardware components of yourcomputer. The Control Panel can be opened in more than one way. Let us see two ways here.1. To open the Control Panel, click on the Start button and then on Control Panel .



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2. Double click on the My Computer icon on the desktop and select Control Panel from the left sidepane.

Control Panel window opens. There are two views of Control Panel. Category View Classic View

Category View is the Default View . Classic View is similar to the one available in earlier versions of Windows. Whatever be the view, everything works the same way. Also, we can switch from one view toanother.



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Control Panel Icons :Now, let us see some of the icons present in the control panel and their functions.

This allows you to adjust your computer settings for vision, hearing and mobility.

This allows you to customize your mouse settings such as the button configuration,double-click speed, mouse pointers and motion speed.

This allows you to customize your keyboard settings such as the cursor blink rate and thecharacter repeat rate.

This allows you to set the date , time and time zone for your computer.



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This allows you to change the appearance of your desktop, such as the background, screensaver, colors, font sizes and screen resolution.

This allows you to customize settings for the display of languages, numbers, times anddates.

MS-DOS There are several windows applications which are used to perform a wide variety of tasks. Let us seehow to use MS-DOS, which is one of the most popular operating systems before the introduction of Windows. DOS consists of text based commands for various actions. Command Prompt can be usedto enter the DOS commands.

To open the Command Prompt, click Start->All Programs->Accessories->Command Prompt

A window as shown below appears on the screen.

After the copyright information, it displays the home directory of the user who has logged in. Now, wecan enter any DOS command.



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Let us try the dir command to see a listing of the directory contents.

After you are done with, you can close the application by typing exit at the command prompt or byclicking on the close button.

CLOCK AND CALENDARAnother useful application is the Clock that is displayed on the right corner of the taskbar.Double-click on the clock to open the Date and Time Properties dialog box. If you have theadministrator privilege, you can change the date and time.

On the left side, the current month's calendar is displayed. To see the calendar of a different month,select the appropriate month from the month drop down list box. To change the year, click on the yearspinner (see up/down arrows)to select the year you want.



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To change the time, click on the digital clock. Highlight the hour, minute or second by just draggingthe mouse pointer over it. Now, use the up/down arrows to change the value as required. You can seethe time changing in the analog clock accordingly. Click OK after you finish.

Your clock would have been setup to show the time of your place by default. Suppose you want tocheck the time in some other time zone. How do we do that? Click on the Time Zone tab. Your currenttime zone is displayed there. You can see from the picture below that mine is Indian Standard Time .

Now, if you want to see the time in Singapore , select the appropriate item from the drop down listbox like this and Click OK to finish.

Now, you can see the Singapore time displayed in the clock. To revert to your timezone, repeat thesame steps listed above.



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MS PAINTPaint is an application which is used to draw pictures. To start Paint, execute the following.Start->All Programs->Accessories->Paint

The paint windows opens up on the screen. And it looks like this.

The Tool Box has the various tools used for drawing and coloring.



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To use any of the tools in the tool box, click on the tool to select it. If you want to draw a rectangle,click on the rectangle. Move the mouse pointer to the drawing area, click and drag to draw the figure.

To color the pictures , you can select the colour of your choice by clicking on the color box and thenusing one of the coloring tools from the tool box .

WORD PADWord Pad is a simple word processor application. A word processor is a program which helps us totype and store text.

To start Word Pad, execute the following.Start->All Programs->Accessories->Word PadWord pad window appears on the screen.



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A small vertical blinking line appears on the top left corner of the workarea. This is called Cursor . Itindicates the current position on the screen. The cursor moves, as you type in the text using thekeyboard. When the end of the line is reached, the cursor is automatically moved to the beginning of the next line. This feature is called Word Wrap . To start a new paragraph or a blank line, usethe Enter key on the keyboard. To set the margins, click on Page Setup from the File menu.

To edit any text that you have typed earlier, move the cursor to the place where you want toedit using the arrow keys. To delete any text, use the Backspace/Delete keys on the keyboard. Backspace deletes the character before the cursor and Delete deletes the character after the cursor. If you are in Insert mode , the new text that you type will be inserted. If you are in Overwrite mode , the text that you enter will overwrite the existing text.

We can change the mode by pressing Insert Key . If you are in Insert mode, pressing Insert key willtake you to the overwrite mode and vice versa.

WINDOWS EXPLORERWindows Explorer is a program that helps us to manage the files and folders. To start WindowsExplorer, click onStart->All Programs->Accessories->Windows Explorer



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You can also start it by right clicking on the Start button and clicking on Explore from the menu thatappears.

The Explorer window opens as below.



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EXPLORER BARExplorer Bar contains some useful tools which help us to work with icons contained within the currentfolder. This bar is divided into three categories, viz.,

File and Folder Tasks Other Places Details

File and Folder Tasks : This allows you to work on files and folders. You can make a new folder, sharethe folder among a group of users and so on. Also, File and Folder Tasks is context-sensitive. i.e., itdepends on what folder you choose.Other Places : This helps you to switch over to other folders.Details : This provides some details about the open folder.



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Just click anywhere on the caption of any of these categories to see how it collapses/expands . Also,try to navigate to other folders by means of the Address Bar by clicking on the down arrow there.File and Folder ViewsWindows Explorer gives us an option to view the files/folders in different ways. To check how it works,click on the Views button in the toolbar and play around with the different views enlisted there.Icons View : The Icons View shows the file/folder's icon and its name only.



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Tiles View : This view is almost similar to Icons View except that the file icons will have some extrainformation displayed like the type of file, size of file etc.

Thumbnails View : In this view, the documents that contain pictures are displayed as minimized

pictures rather than as icons.



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Filmstrip View : This view is available only in folders that contain pictures. When you click or point toa picture, an enlarged copy of the picture appears in preview area.

List View : This view retains the small icons but displays the files and folders one below the other incolumns.



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Details View : This view displays details like file size, type, last modified date and time along with filenames and small icons.

CREATING NEW FOLDER There are many ways to create a New Folder .1. One way is to use the Make a New Folder option, which we've already seen under the File andFolder Tasks in the Explorer Bar . Once you click on this option, it creates a folder in the right pane.Enter the name of the file and then press Enter key.



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2. Irrespective of whether you are in the Explorer View or in the Folders View, first, select the folderunder which you want to create the new folder. Then, right click in the empty space in the right paneof the Explorer window. Click on New and then Folder from the submenu.

A new folder with the name New Folder is created as shown below and the cursor blinks there withthe name still highlighted. Now type the name that you desire to have and press ENTER . In case you



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pressed ENTER before typing in the new name, then the folder gets saved in the name New Folder .In this case, you may have to rename it to the desired name which we'll see later.

Selecting Files/FoldersAny action such as moving, copying or deleting a file or a folder would require the file/folder to beselected before being moved/copied/deleted.

To select a file/folder, just click on it to make it highlighted. Selecting more than one file/folder can bedone in any of the following ways.

1. If you want to select consecutive files/folders , click on the first file/folder. Then point the mousepointer to the last file/folder, hold the SHIFT key down and click.



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2. If the files/folders to be selected are not consecutive, then click on the first file. Move the mousepointer to the second file to be selected and click while holding the Ctrl key down. Repeat theprocedure for each of the file to be selected. If you select a file wrongly, to deselect it, click on it whileholding the Ctrl key down.

Moving Files/FoldersMoving a file/folder removes it from the source location and places it in the destination location. This isdone using Clipboard which is a temporary storage area.Let the left pane display the Folder Bar . Now, from the right pane, select the files/folders which youwant to move. Then Cut the items by using any of the following methods.

Click on the Edit menu and select Cut Right-Click on the selection and select Cut from the shortcut menu Use Keyboard combination Ctrl+x to Cut

Click on the folder to which you want to move these files. Now, Paste the items by using any of thefollowing methods.

Click on the Edit menu and select Paste Right-Click on the folder and select Paste from the shortcut menu Use Keyboard combination Ctrl+v to Paste



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You can also move the items using Explorer Bar . Let us see how to do that. If you are not already in

the Explorer Bar view, click on the Folders icon on the Toolbar to display the Explorer Bar. Go to thefolder from which the items need to be moved out. Select the items to be moved using the methoddescribed for selection. Now, the Explorer Bar will display the following options.

Move the selected items Copy the selected items Publish the selected items on the Web Email the selected items Delete the selected items

Now, click on Move the selected items option. You will be provided with Move Items ListBox.Browse and select the desired destination to move items to. Once this is done, the items aremoved automatically. That's it!! Please remember that, after moving, the items will not be available inthe source destination.



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This can also be done from the Edit menu. Just try it out and see!!Renaming Files/FoldersSometimes, you might have stored the file in one name and may want to rename it later. Renaming afile/folder can be done in any of the following ways.1. Click the file/folder to be renamed. From the Explorer Bar, click on Rename this file . The name of the selected file gets highlighted . Now, type the new name and press ENTER . The file gets displayedwith the new name.

The second and third methods can be followed irrespective of whether you are in Explorer Bar view orFolder Bar view.2. Right click on the file/folder to be renamed. Select Rename from the shortcut menu that appears.

Type the new name and press ENTER .3. Select the file. From the Menu Bar , select File->Rename and complete the procedure as givenabove.



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Copying Files/FoldersCopying a file leaves the original file as it is and creates a fresh copy of the file at the destinationlocation. To copy the files, first select the files to be copied. Then copy the items using any of thefollowing methods.

Click on the Edit menu and select Copy Right-Click on the selection and select Copy from the shortcut menu Use Keyboard combination Ctrl+c to Copy



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Now, click on the destination folder and Paste the items using any of the following methods. Click on the Edit menu and select Paste Right-Click on the folder and select Paste from the shortcut menu Use Keyboard combination Ctrl+v to Paste

You can copy the selected files using Explorer Bar also. After selecting the items to be copied, clickon Copy the selected items option from the Explorer Bar . You can see a Copy Items List Box.Browse and select the desired location to copy the files. That's it! You can also create a new folder (if required) using the Make New Folder button.



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Deleting Files/Folders There is a special folder called Recycle Bin to hold the deleted files. As soon as you delete a file, itgoes to the Recycle Bin. You can empty the recycle bin whenever you want. Recycle Bin has an optionto restore the deleted file to the original location. This can be used to retrieve the file, in case it wasdeleted by mistake.First, select the files to be deleted. Right-click on the selection to get the shortcut menu.Select Delete from the shortcut menu. The files will get deleted; In other words, the files get moved tothe Recycle Bin .



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Just like Move and Copy , if you want to Delete from the Explorer Bar , click on the Delete theselected items option and follow the procedure as described in Move/Copy.Emptying Recycle BinCan you see the Recycle Bin icon on the Desktop? Open the Recycle Bin. You can see the ExplorerBar in the left pane and the contents of the Recycle Bin in the right pane. You can see two optionsdisplayed in the Explorer Bar under the Recycle Bin Tasks .

Empty the Recycle Bin Restore all items

If you want to Restore one or more of the items, select those items from the right pane. Clickon Restore selected items from the left pane. The selected items would be sent to their originaldestinations. In case you want to restore all the items, without selecting any of the items, clickon Restore all items option from the left pane.

To empty the Recycle Bin, choose the Empty Recycle Bin option from the File menu or clickon Empty Recycle Bin option from the left pane of the Explorer Bar .Pls note that, if you click on Empty Recycle Bin , all the items will be deleted permanently from thestorage, even if you have selected a few items from the right pane. Once this is done, there is no wayto get back the files.

Copying Files to CDCopying a file leaves the original file as it is and creates a fresh copy of the file at the destinationlocation. To copy the files, first select the files to be copied. Then copy the items using any of thefollowing methods.

Click on the Edit menu and select Copy Right-Click on the selection and select Copy from the shortcut menu Use Keyboard combination Ctrl+c to Copy



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Now, click on the destination folder and Paste the items using any of the following methods. Click on the Edit menu and select Paste Right-Click on the folder and select Paste from the shortcut menu Use Keyboard combination Ctrl+v to Paste

You can copy the selected files using Explorer Bar also. After selecting the items to be copied, clickon Copy the selected items option from the Explorer Bar . You can see a Copy Items List Box.Browse and select the desired location to copy the files. That's it! You can also create a new folder (if required) using the Make New Folder button.



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Deleting Files/Folders There is a special folder called Recycle Bin to hold the deleted files. As soon as you delete a file, itgoes to the Recycle Bin. You can empty the recycle bin whenever you want. Recycle Bin has an optionto restore the deleted file to the original location. This can be used to retrieve the file, in case it wasdeleted by mistake.First, select the files to be deleted. Right-click on the selection to get the shortcut menu.Select Delete from the shortcut menu. The files will get deleted; In other words, the files get moved tothe Recycle Bin .

Just like Move and Copy , if you want to Delete from the Explorer Bar , click on the Delete theselected items option and follow the procedure as described in Move/Copy.Emptying Recycle BinCan you see the Recycle Bin icon on the Desktop? Open the Recycle Bin. You can see the ExplorerBar in the left pane and the contents of the Recycle Bin in the right pane. You can see two optionsdisplayed in the Explorer Bar under the Recycle Bin Tasks .

Empty the Recycle Bin Restore all items



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If you want to Restore one or more of the items, select those items from the right pane. Clickon Restore selected items from the left pane. The selected items would be sent to their originaldestinations. In case you want to restore all the items, without selecting any of the items, clickon Restore all items option from the left pane.

To empty the Recycle Bin, choose the Empty Recycle Bin option from the File menu or clickon Empty Recycle Bin option from the left pane of the Explorer Bar .Pls note that, if you click on Empty Recycle Bin , all the items will be deleted permanently from thestorage, even if you have selected a few items from the right pane. Once this is done, there is no wayto get back the files.