A Dock Extra was one of many functions of Mac OS X. It is also known to Macintosh users as Docklets. Before Menu Extras arrived, there was no way in Mac OS X to, for example, show AirPort networking signals, battery levels, and related items. Also, the Control Strip ceased to exist, beginning in Mac OS X. To find a way through these problems, Apple Inc. created a function where these could be shown to the user. All a user had to do was to drag a Dock Extra onto the Dock. They were stored in the Dock Extras folder in the Applications folder on the Mac OS X boot volume. (Just by dragging a Dock Extra on or off the Dock did not alter its position within the folder hierarchies).