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Keeping the Standards Straight As you investigate different wireless technologies and standards, it s easy to become confused by the many standards and numbers. Keep in mind that the IEEE s job is to create standardization for different kinds of networks that use the same technology. The end result is that different devices can work together on the same network. Using the 802.15 standards, devices such as laptops, PDAs, cellular phones, and other portable devices can implement the Bluetooth specification, and they can all communicate and work together on the same WPAN. You ll see different IEEE standards apply to different kinds of wireless networks (as well as wired networks), and each time you read about an IEEE standard, you ll know that standards for communication are in place or being developed that will make the technology a viable means of networking for you.

The security subsystem checks the file object s DACL, looking for ACEs that apply to the user and group SIDs referenced in the thread s access token 2 If a DACL does not exist, access is granted Otherwise, the security subsystem steps through the DACL until it finds any ACEs that either allow or deny access to the user or one of the user s groups..

Part III:

Wow, this was a big chapter that covered a lot of features. These features will definitely help you write applications on your own. Specifically, the chapter covered IDE features such as snap lines to help you align the controls on the form. It also covered the rich features of IntelliSense, which help type your code by either suggesting appropriate choices, completing code sentences for you, or providing you with code snippets. In the end, IntelliSense reduces the amount of typing you do, helps you learn the language, and helps your productivity. On top of that, it is a great feature for beginners. You then saw the benefits of the new refactoring feature to rename elements in your source code, elements such as code elements, comments, and even string literals. Then you saw that the refactoring feature s Extract Method command lets you restructure your code by extracting blocks of code and automatically creating new methods with all the supporting code. It is especially useful for replacing autogenerated variable names with more meaningful variable names. You examined the most common controls you will find in every Windows application with some graphical examples and learned when to use them. Finally, the chapter ended with an explanation of how event-based programming is performed. In the next chapter, you ll put into practice everything you just learned in this chapter. You ll also take a look at some new features, controls, and concepts that you ll use as we continue with the Web browser project.

3. If a deny is found at the user or group level, the access is denied. 4. If the security subsystem comes to the end of the DACL and the thread s desired access is still not explicitly allowed or denied, the security subsystem denies access to the object. Therefore, if a DACL exists but is empty, access is by definition denied. At the conclusion of this process, access is either allowed and the file is opened or access is denied, in which case the file remains closed and an Access Denied message is generated. Figure 17-1 illustrates this process.

located in a home, office building, school, or other such structure. A WLAN can also exist as a separate network in addition to a wired LAN if desired. The WLAN uses radio frequencies to enable all computers within the

Subject Access token User SID Group SIDs Privilege information Other access information System checks access control entries. Object Security descriptor Owner SID Group SID SACL DACL Access Control Entry

Figure 17-1