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  Name:     isqueue() - see if the DOS print queue is installed
  Usage:    <logical> = isqueue()
  Params:   none
  Returns:  logical .T. if the DOS print.com program has been
            installed, .F. if not, or error, or DOS version is
            less than 3.00

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

                 if (! isqueue())
                      @ 10,0 say "Can't access print spooler"
                 else
                      q_submit("test.txt")
                 endif

  Note:     Some print spoolers emulate the DOS print.com program
            and may work with the q_* functions. Some
            experimentation may be necessary to check if yours
            does. To install the print queue, simply run the DOS
            program PRINT.COM before you run your Clipper
            application. Once installed, you can submit up to
            10 files (default) for queued printing. See your DOS
            manual for more information on the DOS print program.
            To use the Q functions you must have DOS 3.00 or higher.