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  The other type of command accepted by the ANSI driver is a keyboard
  translation command. When one of these commands is given to the driver,
  the driver monitors keyboard input and replaces one key character with
  another single character or even a whole string of characters. This allows
  the ANSI driver to act as a crude but effective keyboard-enhancer program.

  The two ANSI driver commands are very different in their purpose and use,
  but they are both passed to the driver in the same way--through a stream
  of screen output characters.