Tracing backwards from links

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.