Hello, i was wondering about our usernames in COD4. because in most games ive played which are online such as warrock you can create your own account with a username and password and nobody else can use that username as it would come up the username has been taken. BUT on call of duty 4 and the other Cods you just type in a username and you can play the game which imo is stupid because anyone can pretend to be you. also what happens if i re-install this game do i lose the rank? yet another stupid reason...they should make it so you have your own account.