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Computing (FOLDOC) dictionary
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jargon /eks'ch*/ or /eksch/ To exchange two things, each for
the other; to swap places. If you point to two people sitting
down and say "Exch!", you are asking them to trade places.
EXCH, meaning EXCHange, was originally the name of a PDP-10
instruction that exchanged the contents of a register and a
memory location.