If you really want to get into that business, then look up "emulators". These are environments that run on a machine to enable you to play games as you would on the console. I know there was plenty for PS when I messed around with them, but I am not sure about XBOX360 games. You should look around that arena though, you might get an answer there.
Why what's wrong with buying the consoles? They are relatively cheap to buy - and you can get them all used now since they have been out forever.
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