INT 5B U - SitBack v3.02R - SET ??? FLAG AND GET ??? ADDRESS                    
	AX = 8485h
	DL = 71h
Return: ES:BX -> FAR entry point to ???
Note:	the flag which is modified is located at the address returned by
	   AX=5254h/DL=04h
SeeAlso: AX=8485h/DL=72h