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While the first two parts of the book primarily focus on adding features to your applications, this last part focuses on technique: how to improve your software in ways that may not be visible to the user, but that make it more robust and improve your efficiency. 9, RIM Security : Deciphers the often baffling security model that constraints the behavior of BlackBerry applications. This chapter explains the critical issues that may come up as you develop your application or that emerge only after it has been released. In the process, you ll learn what tools are available to get the permissions you need, and how to deal with cases where your app is forbidden from doing certain things. 10, Porting Your App : Provides an overview of the many issues to face when you make your application available for multiple devices or multiple countries. By learning these lessons early, you can make the inevitable porting process much quicker and more enjoyable. 11, Advanced Build Techniques : Shows how to move from a one-person operation to a more professional and organized approach. Introduces the many tools available for use, including build scripts, debug logging, release packages, and more. 12, Conclusion : Shares some final thoughts on development and offers resources for further education.

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Local authentication is a cornerstone of all modern operating systems, and often the gateway for small and medium businesses to grow into larger directory systems over time A common misconception is that Apple s Open Directory terminology is applied only to its enterprise-class authentication services In reality, the same term refers to those local or client standards implemented in local accounts In fact, in previous operating systems, Apple even had the same technology running on Open Directory masters, such as 102 netinfod and 103 Password Server This concept of architecting what amounts to miniature directory servers into the base operating system allows for later migration to larger directory.

Jesse James Garrett at Adaptive Path coined the original definition1 of Ajax. Quoting the original definition, Ajax incorporates the following features: Standards-based presentation using Extensible HyperText Markup Language (XHTML) and Cascading Style Sheets (CSS) Dynamic display and interaction using the Document Object Model (DOM) Data interchange and manipulation using Extensible Markup Language (XML) and Extensible Stylesheet Language Transformations (XSLT) Asynchronous data retrieval using XMLHttpRequest JavaScript to bind everything together In a nutshell, Ajax is a style of Web development that requires a Web browser. The user interface of the Web browser is dynamically modified using a programming language that retrieves data only when necessary, rather than the traditional approach of refreshing the whole page every time a request is made. I want to highlight the terms dynamically and only when necessary, because those terms are the essence of Ajax. Ajax and JavaScript are examples of duck typing2 and latent-type programming.

Depending on your background and goals, you might approach this book in different ways. The chapters are designed to be read in order, as later chapters may reference content from earlier chapters. However, such

service systems without much reeducation of entry-level system administrators. The best example of this is Apple s parental controls system that, at its base, leverages the same technology used to manage thousands of Mac OS X in enterprise environments every day. Due to such forethought, clients can also be configured out of the box to utilize a variety of other external directory services; support for several network-based directory service systems is provided without the installation of any additional software. This chapter starts with an explanation of how the local directory service works. Once we have explained how local users can be managed, we will move on to discuss LDAP, the industry-standard directory database used to supply directory services. Next, we will cover various types of binding to directory servers from Mac OS X that let end users log into their computers using a centralized username and password. Finally, we will look at building external accounts and show how to build a directory service based on Apple s Open Directory.