Spaces was a virtual desktop feature of Mac OS X, introduced in Mac OS X 10.5 Leopard. It was announced by Steve Jobs during the opening keynote at the Worldwide Developers Conference on August 7, 2006. As of Mac OS X 10.7 Lion, it has been incorporated into Mission Control. Overview Spaces enables users to create multiple virtual desktops suited to the unique needs or work habits of the user. A user could, for example, create and assign a "space" to office work, enabling the user to leave a work-related application (such as a word processor or a spreadsheet) running full screen and then switch to a different space designated for browsing the Internet or navigating file structure in Finder windows. Up to 16 spaces can be created, and applications can be bound to specific spaces. There are various ways to navigate between spaces, including user-configured, function-key combinations, hot corners (via Exposé), or by dragging windows and applications — in the direction of the desired space — to the corresponding edge of the screen and holding for a moment until the space switches. The Dashboard functions as a separate space, on the left of the other spaces by default. Use In Mac OS X 10.5 Leopard System Preferences, a checkbox labeled "Enable Spaces" must first be checked in the "Exposé & Spaces" preferences, under the "Spaces" tab. Then, as many as 16 spaces can be created by adding rows or columns. Application assignments may be added and bound to specific spaces listed, by their corresponding numbers, in the right-hand column. When an assigned application is launched, it will open on the designated space and remain in that location unless it is moved manually to another space. There are a few settings for activating and switching between spaces. A checkbox at the bottom of the panel allows switching spaces automatically when switching between applications bound to spaces. This is achieved either by clicking on application icons in the dock, or by pressing ⌘ (Command) + Tab, and Spaces will jump directly to the space that the chosen application has been assigned to. A limitation of Spaces lies in the fact that some applications featuring tool palettes and/or multiple open document windows (such as Adobe Creative Suite or Microsoft Office applications) cannot be consistently bound to a specific (numbered) space. In such cases, the "switching" function responds to the most recently active