some games have register functions to contact the game`s vendors, others may be lookin for the internet for a multiplayer option, btw counterstrike is the best online game, most games coming out are multiplayeror have an auto update

It would need an opening to do so, since its a new program you would need to set its permission (allow/deny) to the internet, it usually tells you the program and on what port it is trying to access, and the program icon.

Preep
(i usually disbelive a bought game, would have anything nasty in them)

Preep