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They use Perforce. https://developer.valvesoftware.com/wiki/Using_Source_Control_with_the_Source_SDK https://developer.valvesoftware.com/wiki/Using_Source_Cont

They use Perforce. https://developer.valvesoftware.com/wiki/Using_Source_Control_with_the_Source_SDK https://developer.valvesoftware.com/wiki/Using_Source_Contro...