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“Applications like iTunes and iPhoto have established a single window interface as the de-facto standard for modern Mac UI design. This design is great for end users, who no longer have to switch between several windows to be productive with their software. For developers, on the other hand, this design poses several challenges in terms of interaction design and software architecture, especially in the view and controller layers of the MVC architecture prescribed by Cocoa. This post is the first of three that will address this architectural design problem and, more specifically, examine the role of Cocoa’s new NSViewController class in this design.” source...