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Xcode 4 iOS Development by Steven F. Daniel

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Introducing Document-based applications

Document-Based application applies to the Cocoa environment and can be thought of as a mini-application. Creating these types of applications provides you with the ability to have multiple document windows opened at the same time, allowing you to switch focus between each of them. It provides a framework for generating identically contained, but uniquely composed sets of data that can be stored in files. An example of a document-based application is TextEdit.

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