Games i believe don't work at the lan
DOW II (needs online live as far as i know)
Supcom 2 (does not have any work offline LAN at this stage needs online live)
BFBC2 (have to b e logged in to access mufti player menus)
Games i need checked
COH (don't you need to be logged in)
AVP (i did not think that had LAN mode)
Shattered horizons i need to get a dedicated server working for that
Please correct me if any of this is not correct
DoWII - You do need to be signed in, either Online or Offline will work. This is legit I'm talking here, cracked I wouldn't know nor care.
SupCom2 - No thanks.
BF:BC2 - Sounds about right, but if you did grant us sufficient internet privileges it would be an epic game to play, since it's not like regular BF games where you need at least 20 people to have a half decent game, thanks to Squad Rush and Squad Deathmatch, with a player limit of 8 for Rush and 16 for Deathmatch. Though I don't even know if this has LAN play..
CoH - Yes you need to be logged into Relic Online OR have a physical disk/working mini-image.
AvP2010 - Afaik it doesn't have LAN, and barely even dedicated server support (it's what, still in the Beta stages how many months after release?).
Shattered Horizons - I'd really love to play this, it really is a fun game, and it's only $20 on Steam! *nudge nudge wink wink*