Int 2F Fn C00C  - Ad-dos - Set ??? Internal Flag To 01h                    [V]

   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
Range: AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Index: screen saver;AD-DOS