I may have a trivial question.
The Guests group should be much more restricted then the Users group, according to documentation. However, I tested this on my computer (WinXP SP3) with a user that is in the Guests group but not simultaneously in the Users group. The user seems to have the same privileges as if he were in the Users group. (I.e. I can see and modify files, execute any programs including internet browser etc.)
In particular, on my hard disks I never have privileges specified explicitely for the Guests group. But the user obtains the rights that are specified for the Users group. As if the Guests group was a member of the Users group (but it is not).
So, what is the relation between the Guests and Users groups?
My system is WinXP Pro SP3 with default security settings (i.e. I have not modified the privileges on disk folders nor the hierarchy in user groups).