> Those session keys can bother if someone wants to add the www into the
> favourites and the browser saves the URL with the key. You must delete
> the key from the URL manually, and this does not have to be obvious for
> everyone.

No, this is not true. When using the bookmarked URLs your session will
probably have expired and you will be automatically redirected to the
application entry point. Authors of applications might decide to add
additional info to the URL to be able to restore some state in such a
case. Pier is an example of such a web-application.

Lukas

-- 
Lukas Renggli
http://www.lukas-renggli.ch