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Cocoa® Programming for Mac® OS X, Fourth Edition by Aaron Hillegass, Adam Preble

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Chapter 14. Using Notifications

A user may have several RaiseMan documents open when he or she decides that it is too hard to read them with a purple background. The user opens the Preferences panel and changes the background color but then is disappointed to find that the color of the existing windows doesn’t change. When the user sends you an e-mail about this problem, you reply, “The defaults are read only when the document window is created. Just save the document, close it, and open it again.” In response, the user sends you a mean e-mail. It would be better to update all the existing windows. But how many are there? Will you have to keep a list of all open documents?

What Notifications Are and Are Not

Every running application has an instance ...

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