Coming back to the original question, I think a good way you and your friend from the US can play the same SINGLE PLAYER game, and just take it in turns, is to send the save-game file back and forth to each other. Or have a constant synchronization of the save-game file. All this other stuff about multiplayer adventure gaming with DOTT etc. just won't work. Adventure games are meant to be played single player - where there is one protagonist, and the player plays as him/her. I honestly can't think of any way that multi-player would work, but I'm not saying there isn't a way... I just haven't found one yet.