Metro's dashboard

Thanks for the info. But is there a way to "force" a log in each time the site is visited? My scenario is my 25 third graders all in the computer lab accessing their wiki pages, but not necessarily using the same PC that they used two days ago. Many are logging directly in (because of the cookies) and the wiki software thinks that they are a different student. (whichever student logged in properly last time) We've been trying to get in the habit of logging out, then logging back in to make sure... but third graders have lots on their minds.

thanks for any info!