XON/XOFF ==>
software handshaking
<communications> 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)
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