Function            print_screen - issue a PrintScreen

  Syntax              int print_screen(void);

  Prototype in        printhk.h

  Remarks             issues a Print Screen command as if PrtSc were
                      pressed.

  Return value        returns zero if the PrtSc is done, a one if the
                      PtrSc is in progress and 0xFF is an error occurred.
                      See printhk.h for further information.

  See also            isPRINTavail(), PRINTadd(), PRINThold(),
                      PRINTpurge(), PRINTremove(), PRINTresume()