INT 21 U - DOS 3.1+ internal - SHARE.EXE - CLOSE ALL FILES FOR GIVEN COMPUTER   
	AX = 5D03h
	DS:DX -> DOS parameter list (see #01686), only computer ID used
Return: CF set on error
	    AX = error code (see #01680)
	CF clear if successful
Notes:	error unless SHARE is loaded (calls [SysFileTable-30h])
	  (see #01636 at AH=52h)
	not supported by DR DOS 3.41 and 5.0; returns error code 01h
	not supported by Novell DOS 7 (at least through Update 4; may be
	  supported in Update 15)
SeeAlso: AX=5D02h,AX=5D04h