Manual talk:$wgLocalInterwiki

How about an example?

--204.210.158.6 13:42, 10 June 2006 (UTC)

Please explain what this variable does
The default generated by the config script is now (in MW 1.16.0):

$wgLocalInterwiki = strtolower( $wgSitename );

My site name is very long, so would it be better to edit this variable?