Is it possible to modify the file that lists all trusted networks directly?

I’ve been unable to get my GameShell to connect directly to my campus’ Wi-Fi after multiple attempts. I figured I could try editing the configuration files, but the problem is, I don’t know where it’s located, if it’s even modifiable at all. Is it possible at all?

If you look up WICD you’ll be able to find a lot of resources in the forum.