Exposé is a feature of Mac OS X that allows you to see all of your open windows at any time. All you have to do is press the function key labeled with the Exposé icon on your keyboard (F3) and all of your windows will slide around to reveal other windows behind them – shrinking when necessary. It also dims the desktop so that the windows really pop out from the background. You can then move your pointer over one to see the title of that window. Clicking while over a window will switch to that window and every window will resize itself back to normal and slide back to where it was.

This is very useful for finding the window you want to be working in at the moment. It might be better than using the Command+` keyboard shortcut depending on how you like to work. But, it has even more usefulness than that. If you’re working in one window and you want to drag something out of it into a different window, Exposé works for that too. All you have to do is:

1. start your drag
2. activate Exposé
3. hover over the window that you want to drop onto
4. deactivate Exposé
5. complete your drag & drop

Quickly tapping the Exposé key will reveal the windows and they’ll hang there in space waiting for you to do something. But, if you hold down the Exposé key, the windows will rearrange themselves only for as long as you hold down the key. Once you lift your finger, the windows will go back to normal. Holding the Exposé key is a good way to handle dragging & dropping.

You can also activate Exposé through a variety of ways that can be set in your System Preferences. Select the Exposé & Spaces System Preference and you can set Exposé to activate by moving your pointer to one of the four screen corners, typing keystrokes, or clicking mouse buttons.

The normal behavior for the Exposé key is exposing All Windows. Holding the Command key while pressing the Exposé key will move all the windows out of the way to reveal the Desktop. This is helpful since current Apple keyboards only have one function key labeled with the Exposé icon. Using the Command modifier key means you don’t have to remember which other unlabeled function key you may have assigned the Exposé – Desktop command to. Use the same keyboard shortcut to bring the windows back to normal (if you aren’t using the hold method from above). You can also modify the behavior of Exposé by holding the Control key while pressing the Exposé key to show only the current Application Windows. Again, use the same keyboard shortcut to bring the windows back to normal. Finally, for some fun, you can hold down the Shift key while pressing the Exposé key to watch the animations in slow-motion.