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XOOPS websites may use cookies for a variety of reasons, depending on the particular modules accessed by a user. For example; an autologin function will use a cookie instead of manual login, remembered options set by a user in a module may also use a cookie to recall that option when the user returns to the site.

This Q&A was found on XOOPS Web Application System : https://xoops.org/modules/smartfaq/faq.php?faqid=8