(I know the majority will be PC )
Use this to post nicknames/hamachi networks for play.
Tip: not sure if this works for all versions, but you do not have to complete the single player campagin to play the Zombie mode because if you get a friend who has already unlocked it, he can start an online game/Private match and invite you to it ;D.
I have it for PS3 and my nick is Braders_5b
Edited by Tactical_person, 28 December 2008 - 20:57.