Source is a game engine by Valve Software that powers popular first-person games such as Half-Life, Half-Life², Counter Strike, Portal, Portal 2, Left 4 Dead & Left 4 Dead 2.

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How can I run a dedicated server without Steam?

Steam won't let me have two instances running with the same user logged in. Does that mean I cannot run a dedicated server on a PC (for example, for Left 4 Dead 2) and play from another machine? Is ...