1) download and instal on all workstation Tibia
2) download and instal Sandboxie from official site http://www.sandboxie.com/index.php?DownloadSandboxie
3) Run on first workstation Tibia them go to options and make sure you dont set full screen -> default is window mode
4) First player can stay in game. Second do the same thing but run by sandboxie -> login and choice your mighty champion
5) thats all enjoy your game
