INT 2F - AD-DOS - SET ??? INTERNAL FLAG TO 01h
        AX = C00Ch
Return: AX = status
            0000h successful
            000Ch failed
Program: AD-DOS is the DOS version of the After Dark screen blanker for
          MS Windows
Note:   AH=C0h is the default multiplex number; if this is already in use,
          After Dark will try successive values up to AH=FFh
Index:  screen saver;AD-DOS

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