I'm a bit confused: Don't have WLink and WAnchor the same purpose? Is it just that WLink won't emit the internal Path Changed signal?!
It's the location of a resource. It's information.
Wt::WAnchor represents something you can click on in a web page.
It's something visual - such as text or an image, combined with a WLink that is navigated to if you click on the WAnchor.