How Do I Send Variables Over Through P2P?

So I got peer 2 peer working in AS3, I know how to get objects to move with the arrow keys and show up on both SWFs. What I can't figure out is how to send the number or name in a variable to the other SWF. Like, if I were to press a button in one SWF that made a variable turn to "1", how would I get that variable to do the same for the other SWF, even if in that one the button was not pressed with case "NetGroup.SendTo.Notify" :? I've been up all night looking for answers and I can't seem to find any... I'm sure it should be very simple.