window size is actually the number of frames that can be sent without acknowledgement in sliding window protocol and the sequence numbers are produced for these frames. For example if window size is 4 then sequence numbers produced will be 0-4, where 0 - for first frame, 1 - for second frame, 2 - for third frame , 3 - for the last i.e fourth frame, and seq number 4 is for acknowledgment of the 4 framed relayed.
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maximum window size is the difference between highest available sequence number and send_base, knowing that send_base is the sequence number of sent and not yet acknowledged packet. window size= highest available sequence number-send_base=N. note that in GBN window cannot contains already acknowledged packet.
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"The Doggie in the Window" by Patti Page
In Answers.com you can use the little x2 button on the window.
FORMAT / Format Cells / Number tab / Number / 'Decimal places' window / fill in '2'.