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Two potential issues need to be addressed before leaving this topic. First off, the RefreshSection method works correctly only if the configuration file being changed is external to the main App.config. This means that the section being refreshed needs to be defined using the configSource attribute. The second potential is a little less troublesome. The FileSystemWatcher does not respond with absolute accuracy to every single file system event. It is possible that if a large number of files were changed in a short time, the buffer that holds the change information would get overrun and a change might be missed. However, this is really only a hypothetical issue. It is very unlikely, given the filters being used, that a large enough number of changes would be made so as to cause this problem.

Reduce the level of backlighting and dim your screen. On color systems, you can save quite a bit of power by changing to black-and-white (monochrome) mode. Avoid running graphically intensive programs, such as games. Watching movies doesn t drain your battery as much as you might think because spinning the DVD drive isn t as bad as spinning the hard drive. Take advantage of Intel SpeedStep if you re using a mobile PC with an Intel processor (Pentium III or greater). SpeedStep cycles down the processor on newer Intelbased computers when you re mobile. For example, if you have a 2 GHz Pentium 4 laptop, it cycles down to 1.2 GHz when you re running on batteries. Turn off the modem, if not needed, and remove any PC Cards not in use. If you don t plan on using the battery for a month or more, store it in a clean, dry, cool place away from heat and metal objects. NiCd, NiMH, and LiIon batteries selfdischarge during storage. Turn off the monitor when not in use: It consumes more power than any other mobile PC component.

After this lesson, you will be able to: Resolve device configuration issues. Resolve display settings issues. Resolve visual appearance issues. Estimated lesson time: 40 minutes

Explain the purpose of authentication. Describe how authentication occurs on computer networks. Explain the purpose of multifactor authentication. Explain how authorization relates to authentication.

buffer overflow An attack in which the attacker submits user input that is longer than the application was designed to process. canonicalization form. The process of simplifying a path to its most simple, absolute

Using the Machine.config File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

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In the following case scenarios, you will apply what you ve learned about how to use controls to design user interfaces. You can find answers to these questions in the Answers section at the end of this book.

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Figure 2-3 The Internet Information Services (IIS) Application Mappings for the .asmx extension show that it maps to the aspnet_isapi.dll file

Use the following questions to help determine whether you have learned enough to move on to the next lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. Windows XP _________ Edition and Windows XP __________ Edition are available only on supported hardware devices and are not available as stand-alone products. Fill in the blanks. 2. Which features supported in Windows XP Professional are not supported in Windows XP Home Edition

' VB Dim s As New Stack() s.Push("First") s.Push("Second") s.Push("Third") s.Push("Fourth")

Many times, a problem occurs because a piece of hardware has failed. A device driver is corrupt, for example, or new software is incompatible with Windows XP or other installed software, or a computer s basic input/output system (BIOS) needs updat ing. You can research these problems and others through a manufacturer s website. Websites are an especially appropriate tool when troubleshooting a home user s com puter or a computer that has recently been upgraded from one operating system to another. If you have yet to find the problem and a troubleshooting wizard has listed hardware, software, or BIOS problems as the culprit, visit the manufacturer s website for help and updates.