This function can set a customized name for the session that is created during the login process. The default for this session name is "PHPSESSID".
This function can not be called statically.
You have to use setSessionname(), if you are running two or more different applications with Auth on the same domain. If you don't use this function, a user who has once logged in at one of the applications can also use the other applications without logging in again!