How do i activate DLC for Fallout 3 on steam?

I bought fallout 3 game of the year version on steam and it keeps telling me a CD key.

It lets me play the game without asking me for the CD key so is there something special i have to do in order to play/activate the DLC?



I looked on windows live in game and it shows them as available to download.

All help is appreciated!How do i activate DLC for Fallout 3 on steam?
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You may need to copy the DLC files to your Fallout 3 Data folder, I read something vaugely about that.