What do you mean when it says going back since its inception?
Anyways, steam is basically you need an internet connection to initially play the game. Afterwards, though, you can go into offline mode unless you want to get a patch or something like that, which requires you to go online again with Steam.
The great thing about Steam is that your game is tied to your account, not to your computer. That means, you can install any of your games that you have bought on any computer as long as you have your steam account logged in
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