Int 11 Fn 7A  - Rainbowfax V1.3 - Sfengine Api - ???                       [F]

   AH = 7Ah
   AL = subfunction
       01h set ??? flag

       Return: AX = previous state (0000h already set, 0001h clear)
       02h clear ??? flag

       Return: AX = 0001h
       03h set ??? flag (different from subfn 02h)

       Return: AX = 0001h
       else

       Return: AX = FFFFh (invalid subfunction)

See Also: AH=77h,AH=78h,AH=79h,AH=7Ch