The Centre of Excellence in Mathematics website uses cookies. Cookies are nothing more than a simple text file. They are not executable programs and, consequently it is impossible for a cookie to contain a virus, or any other application. Cookies are also very small, and you run no risk of filling your hard drive with too many cookies.
The CEM Cookie that is placed on your computer contains only your unique reference number. There is no information in the cookie that can identify you. The cookie is only valid when you access the relevant CEM website.