Recently active topics in PBwiki tagged with password

In my environment multiple people use the same workstations and when I have gone to introduce the wiki to them it automatically logs in to the last person I enabled. I guess it is with cookies but I don't want to disable cookies. Is there a way to require logging in every time pbwiki is opened??

Can the moderators delete the obvious SPAM from this forum or have an option as on yahoo messages where users can indicate threads to be deleted. Its not so much offensive in the content as bothersome in terms of wading through it.

Thanks

I want students to be able to view without all of them needing to login and edit. Is this still possible? I can get on the Front Page of a wiki I created in January and not have to login. Is this change a new requirement or something I need to change in my settings or someplace?

I got an error message that says this:

[wrong@address.com] is not the email address of this wiki's administrator. At last resort email support@pbwiki.com if you're having trouble resetting your password.

Is there anything else I can try before I email the support people?

I am using the wiki as a forum where my students can meet to construct a group project. I would like to know though how I can see whether they logged on and how long they stayed. Is this possible?