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From The Free On-line Dictionary of Computing (27 SEP 03) : [ foldoc ]
software handshaking
The transmission of extra data on a channel
in order to control the device sending data in the other
direction on that channel. For an EIA-232 connection, this
means sending Control-S and Control-Q characters to stop
and start transmission.
Since software handshaking requires the transmission and
processing of extra data it can be less efficient than
hardware handshaking.
(1996-10-16)