See How can I maintain a session cookie
for more information.
If you don't set an expiration date on a cookie that you've created, it will be deleted when the browser is closed.
If the user wants to delete a cookie created in a previous session, you can set the expiration date of the cookie in the past (or possibly set it to "", I haven't tried this).
If you'd like to learn more, you can read Netscape's Preliminary Specification for cookies.
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Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
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See Writeup Formatting Tips and other pages linked from there for more info.
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