That depends on how you handle your session management.  If you're using
session variables, I do not think there's much you can do in the way of
detecting when they expire (I could be wrong, I don't use Session vars for
several reasons).

I use cookies for my session handling.  A combination of three session
cookies, one that stores their member id, another for a session hash
(security), and another with the date/time a page was displayed (encrypted
if you like).  On each page load requiring the user to be logged in, I check
the timestamp against the current time, and if X minutes have passed, it
resets the other cookies and sends them back to the login page with a
"session expired" message.

The timestamp cookie can also be used in conjunction with session variables
to achieve the same results as long as your users have cookies enabled.

-Justin Scott, Lead Developer
 Sceiron Internet Services, Inc.
 http://www.sceiron.com


----- Original Message -----
From: "Ben Densmore" <[EMAIL PROTECTED]>
To: "CF-Talk" <[EMAIL PROTECTED]>
Sent: Thursday, April 11, 2002 2:39 PM
Subject: how to tell if a session has expired


> Can someone tell me how you can tell if a session has timed out?  I just
> want to redirect someone to a different page if their session has timed
> out,I can't find any reference to this anywhere, I know it's gonna be
> something so simple, but can't seem to find it.
>
> Thanks,
> Ben
>
>
> 
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