The wow authenticator is an additional security measure users can add to their account to keep hackers out. The key is generated every 30 seconds, is never the same thing twice, and if extremely hard to crack, although not impossible. It has been known to be vulnerable to the "middle man attack". This is rare though and requires that the user have a Trojan on their computer.
PS. If you were asking for the CD authentication keys, sorry, those are one use only keys. IF you want a key, go out and buy the disc.
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After you run the install program it will offer up a EULA - End User Licensing Agreement. After you agree to this (by clicking yes) it opens a secure webpage to allow you to setup your account: the # goes on that page.
A free key is called: Your a N00B because you can buy the game. Wow...
Woke Yoke Wow Key
No, but i wish it did.
To preview an item on your character before you purchase it you can hold down either control key while you click on the item. Items such as Rings, and trinkets will not be visible on your character.