So my brother and i both purchased arma 2:CO for 2 different steam accounts. I installed Arma and Dayz on my computer and played a good 4-6 hours. My brother wanted to play but could not install it on his computer until the next day. He then logged onto his steam on my computer and played DayZ. The problem now is that when he finally installed it to his own computer, everytime he joins a server, it joins onto my character. Does anyone know whats happening and how we can fix this so that we may both play?