single bracket links
These are, I believe enabled in the config file with $BracketWiki.
If this is enabled, you can alias a link either to one word, or to a whole phrase.
[BracketedLinks brackets] [BracketedLinks how to use brackets in links]
I think it's actually turned off in this Wiki, so I cheated
double bracket links
These let you make links to names which are not WikiNames. They also allow you to do a similar aliasing job as the above for WikiNames or or non WikiNames. The name you link to does at least have to have a leading capital, if you don't supply one, the Wiki will. Examples
[[Brackets]] [[Brackets|brackets]] [[Brackets|how to use brackets]] [[BracketedLinks|brackets]] [[BracketedLinks|how to use bracketed links]]
you can find another description of these at FreeLinks