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Is steam multiplayer and friends list thing only foe VALVe games like Counter Strike source

Is steam multiplayer and friends list thing only foe VALVe games like Counter Strike source
no you can add other games you have on your computer open up steam click top left conner bring down a scroll bar and select add program you can add chat programs other none steam games to be in your library so you can start game right from steam and use steam while playing with friends on none steam game.