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“All information presented by a standard Macintosh application appears in windows. [NOTE: information also can appear in the menu bar and can be audio.] To create windows, activate them, move them, resize them, or close them, you’ll call the Window Manager. It keeps track of overlapping windows, so you can manipulate windows without concern for how they overlap. For example, the Window Manager tells the Toolbox Event Manager when to inform your application that a window has to be redrawn. Also, when the user presses the mouse button, you call the Window Manager to learn which part of which window it was pressed in, or whether it was pressed in the menu bar or a desk accessory.” —Inside Macintosh, Volume I, page I-11^b4b

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The windows in OS/2’s Presentation Manager are not merely the graphics on the screen, but also the underlying data structures. OS/2’s Presentation Manager uses windows as a basic organizing tool for applications.

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