Hi guys I got an original copy of Left 4 Dead 2 via Steam, which I installed on my MBP, and my friend's Windows Vista laptop. Is there anyway for us to play LAN? Valve doesn't allow 1 copy of the game to be share, so typing console commands doesn't help. To my knowledge, there's 3rd party software such as Garena,Hamachi and Tunggle which create VPN for users to lan. However these softwares are not Mac-Supportable. So is there any software/method which allow me to play a LAN game with my friend? Thank you.