Int 2F Fn 1121  CU - Network Redirector - Seek From End Of Remote File     [N]

   AX = 1121h
   CX:DX = offset (in bytes) from end
   ES:DI -> SFT
       SFT DPB field -> DPB of drive with file
   SS = DOS DS

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

Note:  this function is called by the DOS 3.1+ kernel

See Also: AX=1228h,INT 21/AH=42h