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With an installed base of 40 million iPhones, you have to be crazy if you aren't interested in writing an iOS application. But where do you start? Most applications are going to be network connected. So what about a project that spans across both, such as a chat application. In this article I show you how to build a chat application with both server and client components. You can learn much from it about creating iOS applications that I guarantee you will want to write one by the end of this article.
Building the application starts with architecting the solution. Figure 1 shows the architecture of how the iOS device (the iPhone in this case) connects to the server through two PHP pages.
Figure 1. The Chat App client/server architecture
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