That's more an aspect of Steam, if I understand what you're asking about, Bob. Games from Valve use steam to update their code, so when you launch a game, it will launch Steam first to download any updates. The recent stuff about Portal 2 and the updates to the original Portal occurred much in the same way that a security patch might occur for Windows. You just don't get a say in whether or not you can download it in order to play the game (unlike the Windows updates).
Ebony the Black Dragon
http://ebony14.livejournal.com
"Good night, and may the Good Lord take a Viking to you."
Ebony the Black Dragon
http://ebony14.livejournal.com
"Good night, and may the Good Lord take a Viking to you."