Networking :: Sharing WEP Key Across All Users

I'm on the road with a laptop and my wife. I can get into various networks (like my father in law's) but just to make life nicer, I'd /like/ to only have to enter the wep key once ... in my profile. For instance: I get on the network under my profile. I then log off, and my wife logs on. She has to enter the wep key in her profile. She logs off and a cousin logs on (on our anonymous account that has limited privileges) and they also need to enter the wep key. Any way to share the wep key across all accounts? I'm using network manager in ubuntu hardy.