Noob Question So, a friend and I want to play diablo 2. I went out and bought the game. He's going to buy the expansion tomorrow. Several questions: 1) Whats the difference between Ladder and Non-Ladder play? Do more people play on one vs. the other? 2) If he starts a guy tonight on regular, then installs the expansion tomorrow, can he upgrade to the "expansion" version with that guy still intact? Thanks! P.S. We've both played the game before, just never on battlenet.