Int 2F Fn 1109  CU - Network Redirector - Write To Remote File             [N]

   AX = 1109h
   ES:DI -> SFT
       SFT DPB field -> DPB of drive containing file
   CX = number of bytes
   SS = DOS DS
   SDA DTA field -> user buffer

Return: CF set on error
       AX = DOS error code (see INT 21/AH=59h)
   CF clear if successful
       CX = number of bytes written
       SFT updated

Notes: this function is called by the DOS 3.1+ kernel
   PrintCache v3.1 PCACHE.EXE intercepts this function for SFTs where
     the Device Driver Header field points at PCACHE, but does not
     intercept any other network redirector functions

See Also: AX=1107h,AX=1108h,INT 21/AH=40h,INT 21/AX=5D06h