Board Thread:Support Requests - Getting Technical/@comment-4482574-20140528195124/@comment-452-20140528200650

Usage:

In Template:exampletemplate:
 * will be replaced with "this is the first parameter"
 * will be replaced with "this is a named parameter"

It also works backwards: -  is the first unnamed parameter.

Which help page anyway? See also:
 * Help:Template_parameters looks pretty straightforward to me.
 * http://www.mediawiki.org/wiki/Help:Templates#Parameters
 * http://en.wikipedia.org/wiki/Help:Template