The Command reference article from the English Wikipedia on 24-Jul-2004
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Command

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In telecommunication, the term command has the following meanings:

  1. An order for an action to take place.
  2. In data transmission, an instruction sent by the primary station instructing a secondary station to perform some specific function.
  3. In signaling systems, a control signal.
  4. In computer programming, that part of a computer instruction word that specifies the operation to be performed. See command (computing) for detail.
  5. Loosely, a mathematical or logic operator.

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Source: from Federal Standard 1037C and from MIL-STD-188