Steam with Disc Version

[Thee_oddball]

Originally Posted by Les

Even if that is the case though, it's still possible you'll be able to install the boxed version of the game (with it's built-in Steamworks matchmaking code) but not have to register with Steam or have a Steam account, or maybe (but I doubt it) have to install the rest of the Steam stuff until you're prompted to do so after trying to use the games default server browser.

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Peer To Peer Multi-Player Authentication/Authorization verifies the unique ID of a user (their SteamID), determines if that user is allowed access to the game

https://partner.steamgames.com/documentation/api