< snip >
>
>Thats what I said...
>
>Let me re-phrase:
>
>IN THE ROOM
>Brother shut down 2 machines. (Machine A and Machine B)
>
>OUT OF THE ROOM
>Brother play with the switches and by earing the sound was able to know the 2 switches that was assigned to the 2 running machines
>and the 2 that was assigned to the stopped machines. Of course, he dont know to which of the 2 running machines the running switches map, same for the stopped machine. But he have now 2 pair of possibility.
>Brother turn OFF the switch of one running machine switch and turn ON the switch of one of the stopped machine.
>
>IN THE ROOM
>One machine run, so Brother can say to which switch this machine was mapped (the one he left ON).
>Now he know that the other that run when he first leave the room was mapped to the switch he turn OFF.
>Brother try to start the machine C and D, the machine that start was mapped to the other ON switch and the other to the remaining OFF switch.
>
>
>Thats all :-)


That's it, I thought you had said he would have to enter the room twice.
Very good.