[Catalyst] logout and go back to previous session?

[Carl Johnstone]

> anonymous is not 100% anonymous.
> each "anonymous" session will have it's own user-id (without username
> and possibility to login as this user) - this is to make sure one
> doesn't have to register in order to use basic functionality of the
> system (which needs to create some records in database).

It still doesn't matter.

If you have 20 people all use the same computer, and none of them login - 
how many anonymous users do you have. How do you tell the difference between 
them and switch between them?

Carl