Hey guys and gals,
I did some asking around,and they told me it can be done with a carrefully crafted trojan,embedded in a mod/map you download during the lan party.
Even with a software firewall installed many people will think this is normal when your firewall starts warning you,since the trojan will have the name of the mod/map you download.When the av starts warning they tell them its ok to ignore the file or you cant play with us.This will not work with most Antionline people(lol)Grtz HotSpot and thx for all the re.