Int 2F Fn 1120  CU - Network Redirector - Flush All Disk Buffers           [N]

   AX = 1120h
   DS = DOS DS
   ???

Return: CF clear (successful)

Notes: this function is called by the DOS 3.1+ kernel
   uses CDS array pointer and LASTDRIVE= entries in DOS list of lists

See Also: INT 21/AH=0Dh,INT 21/AX=5D01h