If this isn't what you're looking for I'm sorry, It's just what I know :0) -- Zak
Most of the times I've heard the term "keychaining", it pertains to keeping your users information for a specific machine on a vitual encrypted "keychain". That way every time someone visits a site, say, and enters a portion of said site that is protected, it will look at that users encrypted "keychain" to verify they are qualified to view whatever is protected without forcing them to log in ever time. This is used VERY WIDELY on the Macintosh platform. You even have a program called "Keychain" that stores all your passwords in a 128b encrypted database.
If this isn't what you're looking for I'm sorry, It's just what I know :0)