browser keeping ssl v3 session open

my colleagues have a problem. they have a website that uses https and ssl v3. user identification is via smartcard and pin. if i have more than one browser window open, and then visit the secure site with one of them, even if i kill that window, the others have the ssl session still open and can visit the secure site without re-authentication.
anyone know of standard methods of handling this situation?
ta.

Welcome to the forums!

Isn't there a log out button that clears cookies (like VBF has)?
Click it before you exit that session.