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Powerline networking is a lot like HomePNA, but instead of using your existing telephone lines, you use your electrical lines That s right, Powerline networking uses a NIC that plugs into a standard AC outlet Other computers in your home plug into other outlets, and communication between computers occurs over the electrical lines without disrupting any other electrical services Powerline networking also provides speeds of 8 14 Mbps transfer, so the system s speed is comparable to that of HomePNA So why use Powerline The main reason for using Powerline networking is that AC receptacles are more readily available in homes and offices than telephone jacks, which gives you more networking flexibility Is Powerline a better, more flexible choice than HomePNA Not really You face the same speed and Internet connection challenges as HomePNA, and Powerline networking can be problematic, although sales brochures might tell you otherwise.

Using a name server to locate resources is generally preferable to broadcasting, for two reasons:

Broadcasts are not usually forwarded by routers. Therefore, only local subnet NetBIOS names can be resolved. Broadcast frames are processed by all computers on a subnet.

Figures 24-14 (part 1) and 24-15 (part 2) illustrate the NetBIOS name-resolution methods used by Windows XP Professional.

Powerline technologies have had a lot of problems in the past due to noise and distortion on traditional power lines within the home For example, your home network might work fine until someone turns on a hair dryer or a toaster Then, the static and interference could bring the network to a standstill However, recent developments in the ways that Powerline NICs use frequencies over cabling enable the Powerline network to adjust frequencies as needed, so that network disruptions are not as problematic Also, some providers use an encryption method for all network communications in the event that data gets transmitted from the local home or office onto the main power line Powerline networking is a practical and viable alternative, and one that continues to mature.

24:

Figure 24-14

In fact, you might see more and more Powerline offerings including broadband Internet over power lines in the near future, so this is certainly a technology to keep your eye on For the home and small office network, this technology does work well, although you can expect some hiccups from time to time If you think that Powerline networking might be right for you, be sure to purchase the required equipment from a recognized manufacturer, and review Table 3-3 for a summary of features To learn more about Powerline networking, go to wwwhomeplugcom Table 3-3 Powerline Networking Features Networking Issue Powerline Feature or Failure.

Part IV:

Figure 24-15

You ll now look at the first series of data elements offered by the debugger while you re stepping through your code. At the bottom of the Visual Studio screen, you can see a series of tabs, which can include Locals, Watch, Immediate Window, Output, and Error List. If you don t see these tabs, you can open these tabs by selecting them in the View and Debug menus. Most of these are not visible when you re working in editing mode. While you re debugging, the Locals tab is usually on top and shows the current variables and object information. Beside it you ll see the Call Stack that displays all methods that have been called, enabling you to follow the execution of your application at any given point during the debugging. Figure 7-5 shows the two windows.