How does that work? I, for example, have Crysis on a retail disk that I bought years ago. I now note that Steam has Crysis on it, so how would I go about telling Steam I have Crysis?
And if I can do this, and ever lose the DVD (or something) can I download and play it via Steam without the disk?
Actually, if I do this, can I then play the game without the DVD in the drive?