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out-of-band: [from telecommunications and network theory] adj.
   1. In software, describes values of a function which are not in its
   `natural' range of return values, but are rather signals that
   some kind of exception has occurred.  Many C functions, for
   example, return a nonnegative integral value, but indicate failure
   with an out-of-band return value of -1.  Compare hidden
   flag, green bytes, fence.  2. Also 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 email, such as
   telephones or snail-mail.