how to check product key? STEAM to use for origin

So you are asking how you can find out you're redeemed Steam Keys so you can use em on Origin? Did i get this right?

giggling and facepalming running in circles

yes i did use the steam key for origin on the origin humble bundle for example and it worked there too of course, so no facepalm... i read about an entry in the registry but cannot remember where again.

Some games give you a link "CD Key" in your Steam games library (not all games give this option though) - on the right side of the steam library window after you already select the game (where the DLC, support, etc links are visible).

http://www.steamgifts.com/forum/mPDjj/origin-redeemable-list

In Steam Client: Game library -> Select Alice-> List of Links on the right, CD key

why the hell would you want to use origin over steam? this is madness! :|