How do you create a wikilink.

Having a problem creating a wikilink. Is this a tool for documents outside my DEVON Pro Office database such as pdf or text doc in my user folder or is this link only within DT database. Is their a wikilink command or is it just a description of what it does.
A step by step example would be helpful for a link inside/outside the database.

Thank You

Automatic Wiki links can be enabled via Preferences > Editing. You might also have a look at this thread: viewtopic.php?f=2&t=4436