The wiki holds the pages that make up the information of the web site.
All wiki pages are visible to everyone, but THCC club members may also edit the pages. Using a wiki means that all page changes are recorded. You can see the page history - showing who made the change and what they changed. It is also possible to undo a page change, so you need never worry that you might damage a page.
You do not need to log in to see the wiki pages, but if you need to log in to edit the pages. The overworked webmaster is planning to improve things, but for now you have to log in to the wiki even if you have already logged into the forum. The account used for the wiki is the same as the one used for the forums and the password is the same.