Changes in Mission Control
When Exposé first premiered in 2003, it could be controlled using the F9, F10 and F11 keys.
The Exposé shortcut keys were moved to the F3 key to make room for the "rewind", "play/pause" and "fast forward" keys. On Mac keyboards made after 2004, Exposé can be activated by using the F3 key or in combination with the command key, or on the trackpad of Macbooks supporting multi-touch interface. (However, F9, F10 and F11 can still be used for controlling Exposé with the function modifier key, or by enabling the "Use all F1, F2, etc. keys as standard function keys" setting.)
On OS X 10.6 (Snow Leopard), Exposé featured a new organized grid view and allowed users to activate Exposé from the Dock.
In OS X 10.7 (Lion), Exposé is replaced by Mission Control. It gives an overview of all running applications just like "All windows" but groups windows from the same application. At the top of the screen it gives quick access to the Dashboard, Spaces, and running full screen applications. There however does exist an option for multi-touch trackpad users to gesture an Expose view of the current application (swipe four fingers up or down to show the desktop or display all open windows in Exposé.)
However it is not possible to get an unobscured "Exposé" view of all the windows in single workspace, since windows of the same application are always hidden in bundles. In situations with many windows of the same application the 'mission control' screen will show the user less content, rather than more.
Read more about this topic: Mission Control (OS X)
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