Int 7F Fn F0  - Alloy Mw386 - Restrict Directory To Group                  [N]

   AH = F0h
   AL = group number
   DS:DX -> ASCIZ directory name

Return: CF clear if successful
       AX = status
       0002h directory not found
       0003h directory not found
       0005h directory in use, cannot be restricted
       02xxh restricted to group xxh
   CF set on error

Note:  the restriction on the directory may be removed by calling this
     function with group 0, then using AH=F1h to assign the directory to
     group 0

See Also: AH=F1h,AH=F2h,AH=F3h