Mac OS X Users
1. Press and hold the Command-key
2. Keep holding down the Command-key and press the Tab-key. A row of icons will appear onscreen.
3. Drag your mouse over the icons or press the Tab-key again and the next application will be highlighted. To move backwards in the row of icons, press Shift-Tab. This key command makes it easy to quit running application...
4. Still holding the Command key, click the Q-key and the highlighted application will quit.
5. Continue for each icon and soon you'll have quickly quit each running application.
Windows Users
1. Press and hold the Alt-key
2. Keep holding down the Alt-key and press the Tab-key. A row of icons will appear onscreen.
3. To move backwards in the row of icons, press Shift-Tab.