Template to create a message key name for coded entry in MediaWiki:sidebar edit

Petr Blaise asks: Jim, can you kindly try to share specific step-by-step instructions? Your notes below are a bit too brief for me to know how to accomplish their promise.
From http://www.mediawiki.org/wiki/MediaWiki_talk:Sidebar
... templates can be used to create a portable URL, such as this:
{{SERVER}}{{localurl:Special:Allpages}}?&from=&namespace=1 ...
-- Peter Blaise peterblaise 12:39, 13 June 2007 (UTC)
-- revisions by AJim 16:13, 13 June 2007 (UTC), with thanks to Alexis Moinet who suggested templates on Mediawiki-l.
Thanks -- Peter Blaise peterblaise 16:34, 13 June 2007 (UTC)Reply[reply]