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.
The overworked webmaster is planning to improve things, but for now you have to log in to the wiki as well as the forums. The account name is the same for the forums and the wiki and so is the account password. You do not need to log in to see all of the wiki pages, but if you do log in you can edit the pages as well.