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OK, so I purchased DiRT 2 again but this time in downloadable form through Valve's Steam client. Now, I plan to give away my physical version, since it would be pointless having two of the same game on the same platform. Since I already used Games for Windows - LIVE with DiRT 2 before with the original CD key, I have just realised I didn't get prompted to enter a CD key when I signed in through the Steam version (I did have the other game uninstalled long before this).
So, how do I know if it is using the original key (physical one) because I used the same gamertag or did it use the Steam supplied one automatically? I don't want to give this game away, knowing someone might not be able to play it online because they key is already in use.