SESSION values show up days later!

[Mary Anderson <maryfran@xxxxxxxxxxxxxxxxxx>]

Hi all,
   I use session variables to store values from one page to another on 
my website.
   Alas, sometimes, but not always, the values persist from one 
invocation of the script to another!
   Just how, exactly, do I make them go away when a user exits the 
program? I assume my users will not always be logging out explicitly.
   Thanks.
    maryfran

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