INT 2F - AD-DOS - UNBLANK MONITOR
        AX = C009h
Return: AL = 00h if successful
Program: AD-DOS is the DOS version of the After Dark screen blanker for
          MS Windows
Notes:  AH=C0h is the default multiplex number; if this is already in use,
          After Dark will try successive values up to AH=FFh
        this function works by simulating keyboard activity
Index:  screen saver;AD-DOS

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