cocoa programming not only preferred development environment for Mac OS X, is it? s also a major tool for making software iPhone and iPod Touch. For example, you can: Xcode underlie See how your application as the main component of Apple's IDE Notice the basics of the language Objective-C, Cocoa interface elements, and object-oriented programming Use Tidy Xcode and Interface Builder? Your application with audio, video, Internet features, text style, and more Create stunning graphics applications with the Mac-known See how to build applications with multiple documents and even executables that aren? t traditional Mac applications Use all the exciting new Cocoa features Cocoa Working with numbers, arrays, boolean, and date of document-based application Simplify Building with key-value coding The better you understand the Cocoa programming, the better you can make an application for Mac OS X, iPhone, and iPod Touch.