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Computing (FOLDOC) dictionary
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1. communications The exchange of call control information
on a dedicated channel, separate from that used by the
telephone call or data transmission.
2. Sometimes used to describe what communications people call
"shift characters", such as the ESC that leads control
sequences for many terminals, or the level shift indicators in
the old 5-bit Baudot codes.
3. In personal communication, using methods other than
electronic mail, such as telephone or snail-mail.