ok, really bad english but i think i understand you
You cant use the same cd-key on 2 steam accounts. It will say you already have this game on another account or you already have this game.
elo i need with this a fren lent me COD MW 2 and when i put the key it says me that i duplicate
There are no duplicate Mw2 keys. There are no keygens. You have to use alterIWnet (or MPGHnet) or buy the game.
This is an also an english forum.
/Marked as Solved
Ex Middleman