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  Name:     handles() - get number of available file handles
  Usage:    <integer> = handles()
  Params:   none
  Returns:  integer equal to the number of available file handles

 ---------------------------------- Example ---------------------------------

                 if handles() < 25
                      ? "Not enough handles to run program"
                      ? "Set FILES=30 in your config.sys file"
                      quit
                 endif

  Note:     DOS uses 5 handles for itself.