The new trackpads have multi touch features. Some carried over from older generations but most of them are new...
One finger...moves the mouse and clicks.
Two fingers...together, they scroll on a page or in a window in whichever direction you move them. Apart, they can rotate pictures, zoom in (pinch apart), zoom out (pinch together).
Three fingers...navigates; you can go back and forth thru a folder of pictures, thru webpages, etc.
Four fingers...clears the desktop, accesses expose, etc.
You can view the defaults and change them as necessary under the settings. Just look for "Trackpad."
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For Americans war is almost all of the time a nuisance, and military skill is a luxury like Mah-Jongg. But when the issue is brought home to them, war becomes as important, for the necessary period, as business or sport. And it is hard to decide which is likely to be the more ominous for the [terrorists] -- an American decision that this is sport, or that it is business.
-D. W. Brogan, The American Character
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