Hi,

I am wrestling with a requirement that I keep tabs of
the number of  users that are currently logged into
the system.  

When the user logs in, I can increment the counter (no
problem).  When the user explicitly logs out, I can
decrement the counter.

However, how do I decrement the counter if the user
does not *explicitly* log out, but simply walks away
and the user's session simply times out?  How do I
detect the session expiration and act on that?

TIA!
Paul

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