For people and teams developing mods and games with Valve's Source engine.
Access Orange Box game code and other beta updates with "-beta srcsdk0122".
Posted by Varsity on Jan 24th, 2008
To access it, add -beta srcsdk0122 to the shortcut you use to launch Steam.
The new code supports Visual Studio 2008, once you work past the beta glitches, including the free Visual C++ Express.