I have just discovered that Ray Strode, a Red Hat employee, has added smartcard support to GSD.
This plugin listens for smartcard insertion and removal events and then locks the screen or forces a log out (depending on gconf) when the card used for login is removed.
In a post from June 2007 in his blog, we can read that his team use it for work.
This is really cool, as this idea had passed by my head sometimes.
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