Mesha5, The sims 3 game can be used for up to 5 computers, and if you win the auction all you have to do is call ea/origins and tell them a friendgave you this game and you would like to register the game into your own so then you will need the registration number that came with the game they will either give you a new registration number or they will allow you to use it through your own sign up info, I love the sims 3 you will too