Almost everything in Wiki is implemented as a page. For example Navigation menu is a page that is edited just like other pages.
Special pages are one kind of pages, they aren't created in database like others, but are created by code.
There are a few special types of codes used for the Wiki which can be used in addition to the codes for the forum posts. A basic list of forum post codes can be found here and a basic list of wiki codes can be found here. This page contains also contains instructions for some of tags.
Frequently Asked Questions
See FAQ-page for list of Frequently asked questions.