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2.1. Application Bundles

Medical students dissect corpses to learn about anatomy. They study how the body is put together and the organs found within. They discover how the muscles, bones, and other structures fit together and interoperate. Applications offer similar opportunities for exploration. Like anatomy, the best way to understand how an application works is to look inside.

As you've already heard, there's more to Mac OS X applications than meets the eye. Mac OS X applications aren't files. They are actually folders that contain one or more executables and their supporting resource files. They appear to the end user as a single file because the Finder treats them as a bundle. Bundles are folders that look like files and whose contents are hidden from the user.


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