INT 2F U - DOS 4 only SHARE internal - TURN ON FILE SHARING CHECKS              
	AX = 1080h
Return: AL = status
	    F0h successful
	    FFh checking was already on
Note:	DOS 4.x SHARE has dual functions: FCBsee File Control Block support for large (>32M) media
	  and file sharing checks.  The undocumentedInformation about a product which is not publicly available from the manufacturer, and must be determined by reverse-engineering (disassembly, trial-and-error, etc.).	 Undocumented information tends to change -- often dramatically -- between successive revisions of a product, since the manufacturer has no obligation to maintain compatibility in behavior which is not explicitly stated. commandline flag /NC can
	  be used to disable the sharing code.
SeeAlso: AX=1000h,AX=1081h