Mac OS X Lion: The Missing Manual

Mission Control: Death to Window Clutter

In its day, the concept of overlapping windows on the screen was brilliant, innovative, and extremely effective. (Apple borrowed this idea—well, bought it in a stock swap—from a research lab called Xerox PARC.) In that era before digital cameras, MP3 files, and the Web, managing windows was easy this way; after all, you had only about three of them.

Figure 5-8. Top: Quick! Where’s System Preferences in all this mess? Bottom: With a three-finger upward swipe on the trackpad, you can spot that window, shrunken but not overlapped. Each program’s thumbnail cluster offers an icon and a label to help you identify it. These aren’t static snapshots of the windows at the moment you Mission Controlled them. They’re live, still-updating windows, as you’ll discover if one of them contains a playing QuickTime movie or a Web page that’s still loading.

These days, however, managing all the open windows in all the open programs can be like herding cats. Off you go, burrowing through the microscopic pop-up menus of your Dock, trying to find the window you want. And heaven help you if you need to duck back to the desktop—to find a newly downloaded file, for example, or to eject a disk. You’ll have to fight your way through 50,000 other windows on your way to the bottom of the “deck.”

Mission Control, one of Lion’s marquee new features, tackles this problem in a ...