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Chapter 2. Exploring the Desktop > Start Up and Shut Down

Start Up and Shut Down

In the past, Mac OS sometimes needed system extensions installed for some applications to work correctly. These extensions not only provided support for existing “mainstream” applications, but they could also be invisibly running applications on their own, just waiting for the user to call upon them to take action.

System extensions always resided in the System Folder of Mac OS, and were visible as little puzzle-piece icons that blipped across the screen during startup. At least, before OS X came along.


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