The question really becomes where are the username and passwords stored, and how do you get to them?
You can easily create an applet that starts off with a username and password field. Then, if the username and passwords are in a
JDBC addressable database, you can call back to the database using an embedded net driver. Sure, we're talking open ports like crazy, giving an architecture review board a heart attack, but it's certainly possible.
Does sound like a strange approach. I'd really be interested in the justifications for this approach. I think there are easier ways, all things being equal.
-Cameron McKenzie