1 Steam account with games playing on LAN

Is it possible to play a game on one person's Steam account but both of you logged on? Such as both on offline mode playing a LAN game? My friend told me he had World in Conflict, so I wanted to put it on both the computers and play LAN. I would think you could, but I am not sure since it's a newer game and maybe it will want seperate CD-keys even for LAN.

** I know how to set offline mode. I wasn't sure with newer games though if it would have some authentication or something even for LAN.

thanks I am going to give it a try anyway. Only takes 2 hours average to download.

thanks I am going to give it a try anyway. Only takes 2 hours average to download.

sexygirl6t9

I don't think I have ever had Steam ask for for a CD-key, regardless if LAN or just playing alone.

I play Fallout 3 and everytime the game loads up it shows "this game requires a cd-key" and it has a box with my key in it. But if I just press shift tab it goes away.