> - I can't delete a client variable via a 'logout' link/button 
> like I can a session variable using the structdelete function.

Use the DeleteClientVariable function.

> - I cannot specify the length of time I would like them to 
> expire in individual applications. I can set it in the CF 
> administrator, but the expiration times differ between my 
> apps.

You can do this with a little bit of code. There are many potential
approaches to this; you could delete the connection between the browser and
the Client variables (typically, the CFID and CFTOKEN cookies), or you could
set a Client variable to store the time the user's session started, and use
conditional logic to compare the current time with that original time on
each page request.

Dave Watts, CTO, Fig Leaf Software
http://www.figleaf.com/
voice: (202) 797-5496
fax: (202) 797-5444
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