Int 2F Fn 112B  CU - Ifsfunc.exe (dos 4.x Only) - Generic Ioctl            [N]

   AX = 112Bh
   SS = DOS DS
   CX = function/category
   DS:DX -> parameter block
   STACK: WORD value of AX on entry to INT 21 (440Ch or 440Dh)
   ???

Return: CF set on error
       AX = DOS error code (see INT 21/AH=59h)
   CF clear if successful

Note:  this function is called by the DOS 4.0 kernel