Forum:Short description at the top of the window

How do you add to the title at the top of the window? For example, Wookieepedia says: "Wookieepedia, the Star Wars Wiki" at the top of my browser's window.
 * Hiya! That can easily be done by editing MediaWiki:Pagetitle. The mainpage has a unique title called MediaWiki:Pagetitle-view-mainpage. Make sure they contain important keywords, and arent too long. The longer your pagetitle, the lower you'll appear at Google. Mark  ( talk ) 21:25, July 9, 2010 (UTC)