The ACK reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

ACK

In the Transmission Control Protocol, ACK packets are used to acknowledge receipt of a packet. They are used by both ends of the connection to move in between statess, and are the basis of TCP's reliability.

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In ASCII, ACK is short for the "Acknowledgement" control character (code 6).

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