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  Name:     q_cancel() - cancel all printing by the print queue
  Usage:    <logical> = q_cancel()
  Params:   none
  Returns:  logical .T. if print queue cancelled, .F. if not, or
            DOS version is less than 3.00

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

                 q_submit("test.prg")
                 ? "To cancel printing, press ALT/Q"
                 set key 272 to QCANCEL
                 return

                 PROC QCANCEL
                 para d1,d2,d3

                      q_cancel()

                 return

  Note:     You must have installed the DOS print.com program for the
            Q functions to work properly. Your DOS version also needs
            to be 3.00 or higher. See the q_submit() function for more
            information.