INT 7F - Alloy MW386 - GET USER PRIVILEGE LEVEL                                 
	AH = A2h
	DL = user number (FFh = caller)
	DH = machine number for user
Return: CF clear if successful
	    AL = privilege level
		00h supervisor
		01h high
		02h medium
		03h low
	CF set if invalid user number
SeeAlso: AH=A1h,AH=A3h