Links may only not only refer to a URL such as [[http://www.inria.fr]]. 
They may also specify a text to be displayed instead of the url such as:
[[http://www.inria.fr|Inria]]. The text denoting a link may use all the wiki
syntax such as: [[http://www.inria.fr|The //French// national institute for
__research__ in **computer science** and **control**]].

This is an ##anchor##. A text may refer to that [[anchor]]. As links, 
a user defined ##anchor2|expression## may be attached to an anchor.