Thread:Mathmagician/@comment-5143092-20120622084116/@comment-4674838-20120622162020

It's written in JavaScript, the source code is available at w:c:railgunscript:MediaWiki:RailgunClient.js.

If you would like to use it, you can import it into your global.js with importScriptPage('MediaWiki:RailgunClient.js','railgunscript');

However, it's still in beta-stage. The current version is stable, but it's far from complete. The only features at this time are the Friend's List, and the ability to show/hide the siderail by clicking an arrow in the bottom-right corner of the screen.