If you click on the page name in the navigation area, the wiki looks for pages which link to this page name.
This can be used for so-called wiki badges. You just write somewhere:
ToDo: Call costumer foobar regarding ...
ToDo is CamelCase, so it links to a homonymous page, which isn't very exiting. 
But you can click on the page name on the page ToDo and lo and behold, you find every page that also includes a ToDo.