SessionUserFolder is just like the standard User Folder, except that it keeps the authorization data in a session variable and allows you to log in through a web form.

When you add a session-based User Folder through the ZMI, a simple DTML Method with id="acl_usersLoginForm" will be created. You can customize its look to your taste or you can change the default actions of the forms, but you must not change the names of the form elements. You may also want to include it in your "standard_html_header" or "index_html".