| 1. | The SYN is followed by the packet number at which to restart.
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| 2. | In the meantime the receiver receives packet numbers 5 and 6.
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| 3. | When the receiver receives packet number 6, it sends yet another acknowledgement value of 2.
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| 4. | If packet number 39 is the last to arrive, the receiving computer will sort things out.
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| 5. | After receiving packet number 5, the receiver sends an acknowledgement, but still only for sequence number 2.
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| 6. | At the destination, the original message is reordered based on the packet number to reproduce the original message.
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| 7. | Again, a normal XMODEM implementation would simply discard the packet, the assumption being that the packet number had been corrupted.
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| 8. | If the packet number was missing, it was assumed it was sending to a non-SEAlink XMODEM, and set the window size to one.
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| 9. | Headers include information like " This is packet number X, coming from Y, going to Z, and has Q numbers of characters in it.
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| 10. | On reception of the very first ACK or NAK, the SEAlink sender would " notice " the packet number and continue to use windows.
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