INT 2F CU - NETWORK REDIRECTOR - FLUSH ALL DISK BUFFERS                         
	AX = 1120h
	DS = DOS DS
	???
Return: CF clear (successful)
Notes:	this function is called by the DOS 3.1+ kernel
	uses CDSsee Current Directory Structure array pointer and LASTDRIVE= entries in DOS list of lists
SeeAlso: INT 21/AH=0Dh,INT 21/AX=5D01h