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. . (2001-07-21)