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Input Set Output SetFunction

many 1:

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SP

Local

Variables

BP

Previous

FunctionsStack

Frames

Memory

Stack

Frame

Free

Ret Addr

Parameters

Code

Stack

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Input Devices

Output Devices

gs

Object

Event Operation

Graphics

Hardware/Software

Graphics

Server

Controlling

Process

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Button

(Minus)

Button Button

Window

(Win)

(Display)

Label

(Plus) (Quit)

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Discard

Duplicate

Frame

Prog A Prog BFrame 0

Ack 0

Ack 1

Frame 1

Frame 0

Timeout

Timeout

Retransmit

Retransmit

Frame 0

Frame 1

Ack 1

Ack 0

Frame 1

Ack 1

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Inputs

VersVers

1

Vers

2 N

Voting

System

Output

Input

Driver

...

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SelectNRec

Alternative 1 Alternative 2 Alternative N

Accept

PointRecovery

Establish

PointRecovery

Discard

...

NRec=NRec+1

NRec=1

NRec

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