INT 2F - AD-DOS - INSTALLATION CHECK
        AX = C000h
Return: AL = FFh if installed
            BX = 4144h ('AD')
            CX = 2D44h ('-D')
            DX = 4F53h ('OS')
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
SeeAlso: AX=C001h,AX=C003h,AX=C005h,AX=C007h,AX=C009h,AX=C020h
Index:  screen saver;AD-DOS

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