When enabling the Extension:DynamicSidebar and using the Cosmos skin. The menu simply renders a menu named USER-SIDEBAR which is a link to the article of that name. This menu has no contents and is of a slightly different style than the other menus.
- USER-SIDEBAR
- GROUP-SIDEBAR (does the same)
- CATEGORY-SIDEBAR (I presume is the same but have not tried)
The above is added to the MediaWiki:Sidebar to enable the users own personal menu, if that article User:Username/Sidebar exists and nothing is rendered if that page does not exist, when using other skins.