Timed logouts in X

[Peter Schmiedeskamp <pschmied_(_at_)_yahoo_(_dot_)_com>]

Hello, I'm now settion up a number of e-mail kiosks at
my univeristy.  I've gotten the machines set up
(thanks to some earlier suggestions on this list), but
now I'm wondering if there is a way to log a user out
of their session in X after a length of inactivity.

Thanks in advance.
-Peter
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