Watch the Traffic Lights
When you move around in OS X-native applications, you’ll notice a new set of controls at the left of each window’s title bar, resembling the lights on a traffic signal. The red button works like the close box on OS 9 windows; the yellow button is like OS 9’s zoom box (for resizing the window); and green is for minimizing a window — turning it into a miniature image down in the Dock.
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