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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
duplex
Used to describe a communications channel
that can carry signals in both directions, in contrast to a
simplex channel which only ever carries a signal in one
direction.
If signals can only flow in one direction at a time the
communications is "half-duplex", like a single-lane road with
traffic lights at each end. Walkie-talkies with a
"press-to-talk" button provide half-duplex communications.
If signals can flow in both directions simultaneously the
communications is "full-duplex", like a normal two-lane
road. Telephones provide full-duplex communications.
The term "duplex" was first used in wireless, telegraph, and
telephone communications. Nearly all communications circuits
used by computers are two-way, so the term is seldom used.
http://cit.ac.nz/smac/dc100www/dc_014.htm.
(2001-07-21)