Please Help!

HELP ME!!!! I am currently sharing my D2 with a friend, he is using my games and cd key and all that, and he has D2loader while i get on with my cd and we need to get on together, but we cant cuz we are both using the same cd key....is there ANY way to get on together without having to get another cd key...please help me

Play on diff realms or else you could go to wal-mart open up a d2 chest write down the keys and put the box back up on the shelf=gg key