XPprintFile()
   Report name of a file in PRINT queue
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   Function:   XPprintFile()

               Reports the name of a file in the PRINT queue.
               This function does not submit a file to the queue!
               use XPsubmitFile() for that!.

               Use XPprintCount() to get the #of files in the queue,
               XPprintfile() then reports each individual file.

               This function freezes the Printing untill a call
               to XPprintResume() is done.

               XPaprint(), which returns an Array is probably handier
               than this function.

   Syntax:     XPprintFile(<nFile>) --> cFileName

   Arguments:  nFile is the queue position we want the name of

   Returns:    the Filename.

   Usage:      For i = 1 to XPprintCount()
                    ? XPprintFile()
               endif
               XPprintResume()
               * List's all files in the queue.