A persistent cookie is an information packet that is written to the user's hard drive and, therefore, continues to exist after the web browser is closed. The persistent cookie enables a user to log into a new browser session without having to reauthenticate. The Authentication Service can be enabled to write persistent cookies rather than cookies that are written to a web browser's memory. For more information, see Using Persistent Cookies in Sun OpenSSO Enterprise 8.0 Administration Guide.