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Does steam have an SDK

Does steam have an SDK
Some games on Steam do.
These games include:
Day of Defeat: Source
Left 4 Dead 2
Team Fortress 2
Half-Life 2
Portal
Half-Life 2: Episode 2
Counter-Strike Source
Alien Swarm ( Free on Steam)
Half-Life 2:Episode 1
Left 4 Dead
Half-Life 2: Deathmatch