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The Origin versions of games don't need Steam to launch and most Steam games only use Origin for multiplayer, so I guess they practically work as two copies.

I think you could play both at the same time as Origin and Steam aren't connected directly like Uplay, which when you launch the game from Steam, it opens Uplay.

Which games can be transfered ? And how do I find the key, please ?

Here is the page with confirmed games : http://techgage.com/article/migrating_your_ea_games_from_steam_or_retail_to_origin/

[ Adds Battlefield: Bad Company™ 2 to Origin account ]

Hey … Thanks for reminding me!

origin is made by ea still i have anno and farcry and both launch origin and steam to play them

I added dragon age steam key to origin. And then I bought ultimate edition, activated the dlcs via bioware account = played ultimate edition on steam.

While I was playing Kindoms of Amalur: Reckoning (bought it on a steam sale) I've entered the key of this game from the CD-key section in Origin and it redeemed another copy of it. Whenever I started it from Origin Steam started as well as it was installed in the steam folders, but the "advantage" was that the game progress was synched both with the steam and origin cloud

I think no :( You can't play multiplayer if you installed the game on both platforms -> for multiplayer one installation at any given time.

Couldn't you technically give someone your key to the game to redeem on origin, so they get a free copy?