Download Process Explorer (Google it) run it as admin, scroll down find your tibia client, click on it, scroll down thru your tibia client & find the mutant handle "TibiaPlayerMutex", right click it & click close handle. Open your second tibia client 100% safe. All you are doing is what MC programs do for you. Enjoy PS you'll need to close the handle on the other clients you open too if you want to run more than 2 clients. Hope this helps as it isn't written in much detail i don't have time to explain every detail but you should have no problem doing it just don't close any handle other than "TibiaPlayerMutex".