document, regardless of which space it has been opened upon, so it is usually more efficient to avoid assigning such applications to a specific space and to run them unassigned, opening documents in the desired space. Function-key combinations can also be configured to activate the full-screen Spaces grid view, switch between spaces directionally, or switch directly to a specific space by number. A function allows applications or windows to be moved into (or through) adjacent spaces by dragging and holding the window (or document) at the edge of the screen. During a transition to a new space, a small, translucent image representing the Spaces grid configuration will be shown in the center of the screen for a few seconds, with arrows representing the movement, and the active space highlighted. When viewing the full-screen grid, spaces themselves may be re-arranged by dragging and dropping (requires clicking on the blue "desktop" area, instead of on a window within it). This does not change the application assignments, but is equivalent to manually moving a window or document to a new space. The application will retain its assignment and when launched at a later date, will run on the originally assigned space. Spaces also works effectively with Exposé, another Mac OS X feature, where you can designate a "hot corner" to activate the full-screen feature of Spaces, showing a "zoomed-out" grid of scaled-down thumbnails for each space. Also, when the Spaces grid has been activated, Exposé may be additionally deployed to reveal the active windows or documents on each space. Comparison Although Spaces was a new feature for Mac OS X 10.5, virtual desktops existed for quite some time on other platforms, such as Linux, Solaris, AIX and BeOS. Virtual desktops also existed for Windows and for Mac OS X via third party software., and it has been a standard feature on Linux desktops for a number of years. The first platform to implement multiple desktop display as a hardware feature was the Amiga 1000, released in 1985. Virtual Desktops were finally added to the Windows platform with Windows 10 in 2015. References External links Youtube - Apple - Mac OS X 10.5 Leopard Guided Tour - Spaces Hardmac Developer's Build Information MacOS user interface