INT 2F U - Windows95 - PATCH ???                                                
	AX = 4A32h
	BL = subfunction
	    00h get ???
		Return: AX = flag: subfunction 04h has been used (0000h/FFFFh)
			DX = ??? (0000h/?)
	    01h	patch ??? in IO.SYS (segment 0070h)
	    02h unpatch ??? in IO.SYS
	    03h ???
	    04h set ???, then do subfunction 01h
	    05h unset ???, then do subfunction 02h
	    else
		Return: nothing