Recently active topics in PBwiki tagged with cookies

Is there an easy way to clear cookies so that different users on the same computer will be able to login with their own guest name when using a shared invite key?

Students are using the same computer and I want to use a key for 'contributor' access. Using that key, students in my class or pal classes across the country can login and edit. However, they can't generate new login id's because the cookie on that computer remembers them. I can have them go to browser prefs to clear each time, but that's a large pain. Can there be a 'clear pbwiki.prefs' button added as a plugin?

I've given my students the URL with access code for my pbwiki. But they are denied access with the following message: "You do not have cookies enabled. Please enable cookies to log in."

Many of my students are concerned about privacy/security and do not want to enable cookies. Isn't there any way for them to log in without cookies enabled?

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