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Like many other technologies in OS X, printing technology is layered. The top layer is the custom application code that you write to generate the printed output you want. The AppKit layer provides the printing classes that Cocoa apps use to print. That layer is the focus of this book. The Core Printing layer is a C API that most Cocoa app developers will never use directly because it is ideal for writing command-line tools or performing printing tasks that don’t require a user interface. The Common UNIX Printing System (CUPS) layer provides the low-level services, print queue management, and driver interfaces needed to communicate with printing devices. As an app developer, you don’t need to know anything about CUPS.

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