The authentication system requires cookies. Cookies are small text files that are placed on your computer by websites that you visit. When you visit a website, it sends information to your web browser which then creates a text file. Every time you go back to the same website, your web browser retrieves and sends this file back to the website’s server.
You can find out more about cookies at About Cookies.
The authentication system uses a cookie to keep track of the fact that you are logged in. The cookie is called 'SESSIONID' and expires when you close your web browser.
The authentication system will not work unless you accept the 'SESSIONID' cookie.
If you choose to accept cookies, an additional cookie called 'CookiesAllowed' will be set. This cookie is set so that you do not have to re-accept cookies everytime you use the authentication system. It will expire after 12 months.
You will be asked seperately to accept cookies for each individual site that you visit.