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  Name:     q_file() - get file currently being printed in queue
  Usage:    <string> = q_file()
  Params:   none
  Returns:  a string equal to the filename of the file that is
            currently being printed by the print queue program.
            if there is no file being printed, or the DOS version
            is less than 3.00, then a null is returned.

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

                 q_submit("test.prg")
                 @ 0,0 say "File being printed: "+q_file()

  Note:     The Q functions require DOS version 3.00 or higher.