This markup allows you to enter markup like the following, and more:
Open links in new windows or tabs:
(Do not use href it is an internal link).
Add a title to the link:
(The http is optional).
Add styling or a class to your link:
You can also assign a name or id to a link. And more attributes can be added by modifying the simple attr list.
Note: this is somewhat deprecated as you can now do these kind of things in core by adding a second pipe and your (configurable) choice of parameters. For example, do
[[some.page|Click here|title="Some Page" target=_New]]