Where does Ubuntu store profiles that allow it to remember the credentials to private wireless networks that it has previously authenticate to and used?

I just replaced my Uncle's hard drive with a new one and installed Ubuntu 10.04 on it (he had Ubuntu 9.10 on his old hard drive.

He is at my house right now, and I want him to be able to access his private wireless network when he gets home. Usually, when I upgrade Ubuntu, I have his /home directory on another partition, so his wireless profile to his own network persists.

However, right now, I'm trying to figure out which .folder I need to copy from his /home/user folder on the old hard drive, to the new hard drive, so that he will be able to have wireless Internet when he gets home.

Does anyone know with certainty, exactly which folder I need to copy to the new hard drive to achieve this?