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Getting to Know NAT NAT is a standard previously used by server software to manage network traffic between segments as well as provide security between a private network and the Internet. You can think of NAT as a translator tool that keeps the IP addresses of one LAN separate from another. In the case of Internet access, NAT can allow the router or residential gateway to act as one computer using an IP address in a different range. For example, suppose your office network has 10 computers that use a DSL modem connection, and your internal network s IP address range is 10.0.0.1 10.0.0.10. Instead of each computer using a different IP address to access the Internet, NAT allows the router or gateway to use one IP address in a completely different class and range, such as 207.46.197.100. If an Internet hacker tries to use the 207.46.197.100 address to hack into the network, there is nothing to hack into because there is no actual computer with that IP address. Instead, the real network uses a different range and simply hides behind NAT. In large IP networks, NAT is used to manage routing between different network segments where IP addressing between network clients and different subnets can be complicated and confusing. In many cases, NAT helps network administrators using router hardware to solve connectivity issues and problems between different network divisions. If you are interested in the technical details of NAT, you can access RFC 1631 on the Internet to learn more. A Request for Comment (RFC) is an official document of the Internet Engineering Task Force (IETF) that specifies the details of new Internet specifications or protocols. RFCs can be found on the Internet by using a Web search engine and entering the RFC number, in this case, RFC 1631.

Part II:

In this chapter, you took a simple application and upgraded it to create a professionallooking application with many nice features for your users. You added a splash screen to your application and worked with dialog boxes. You created an About dialog box and a Navigate dialog box to allow your users to navigate to a URL, and you added an autocomplete feature to your text boxes and the autosuggest/append feature using the browser s URL history. You then added tool strips, progress bars, and icons from Windows. You dynamically managed controls, and you learned a lot about new events and how to handle them using event arguments. After finishing the Windows Forms implementation, you learned how to add a second project and created your WPF Web browser. While doing this, you experimented with XAML and the WPF development technique. You implemented a dialog box that allowed you to enter a URL and navigate to it. You then learned how to use a Windows Forms control and use it in WPF to create a hybrid application. In the next chapter, you ll learn techniques to use when things don t go well; that is, you ll learn the art of debugging code. You ll also learn about the Edit and Continue feature, data visualizers, tips and tricks, and much more.

Each device class on the computer has a power policy owner. The policy owner for a particular device class is the component that is best aware of how the device is used. Typically this is the device class driver. Each policy owner must manage power appropriately for its class and work consistently with the operating system s policy for putting the computer into a low-power state. For example, a network adapter might sense that no network cable is plugged in, and therefore request that the operating system put the adapter in a low-power state because it is not being used. To use the ACPI power management features in Windows XP Professional, your computer must have an ACPI-compliant BIOS that is compatible with Windows XP Professional. During setup, Windows XP Professional determines which hardware abstraction layer (HAL) to install on the computer. If the computer has an ACPI-compliant BIOS, an ACPI HAL is installed and you are able to use ACPI power management features. If the computer does not have an ACPI-compliant BIOS, a non-ACPI HAL is installed and ACPI power management features are not available. Note