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1. Put a breakpoint at the first instruction in your application (which is InitializeComponent();), and run the application by pressing F5. 2. If you don t see the Immediate window, just click the Debug menu, and then click Windows and Immediate. You should have an empty Immediate window at the bottom of your screen. 3. Type int i = 5;, and then press Enter. 4. Now type MessageBox.Show(i.ToString());, and press Enter. The message box that appears should show a 5. You can test code in real time during the execution without executing a single line of code from your application. But beware that if you use variables that are in your application and modify them on the Immediate window, you modify them for the application as well. 5. Click OK in the message box, and then click the Stop Debugging button to stop executing the application. You re now not only able to build new applications, but you re also aware of the techniques and tools available to debug them.

In 2000, the buzz about two-way satellite Internet service began appearing in online news magazines and Internet articles. By the end of 2000, Microsoft teamed with Radio Shack to provide the first high-speed, two-way satellite Internet access system. Previously,

Part IV:

This scenario describes how to connect a branch office of a corporation to the Internet. It also explains the differences between setting up an analog modem or ISDN connection, and setting up a cable modem or DSL connection. This scenario also discusses how to configure a computer on the intranet of a branch office to use a VPN to connect to the corporate network. Figure 25-6 shows the initial configuration for a branch office.

Figure 25-6

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The Internet Connection Sharing (ICS) feature in Windows XP Professional provides a simple solution to allow all computers on a local intranet to share the same outgoing connection to the Internet. Note

Never turn off the ICS computer while any of the clients are running, as the ICS computer provides IP address configuration, name resolution services, and a gateway to the Internet. If you do lose power to the ICS computer, the other remote office clients cannot access the Internet because the shared connection on the ICS computer is not available.

DirecPC (part of DirecTV) offered a satellite Internet service, but this service required a standard modem connection to perform upstream data requests: Responses were then sent down to you via the much faster satellite link. MSN s satellite offering is no longer available, but Microsoft s partner company, Starband, now offers satellite Internet service. It is also available through a few other vendors, such as EarthLink s DirecWAY satellite. DirecPC is now offering a two-way satellite service of its own. Satellite Internet is touted as a broadband alternative to DSL. Although this is somewhat true, satellite Internet is not as fast as DSL. File downloads are fast, but there are more pauses and delays during Web surfing. This delay is partly an inevitable aspect of the technology. Sending a request signal from your computer to a satellite thousands of miles in space, having that request relayed to a land-based Web server, having the requested page sent back up to the satellite, and then having it relayed back down to your satellite dish adds up to tremendous network latency, even when transmissions are made at the speed of light! Satellite Internet works with a satellite modem similar to a DSL modem. You typically attach the modem to an available USB port on your computer. The satellite modem also connects to a home satellite dish installed on your roof or a pole in your yard using coaxial cables similar to those used for cable TV. Sending and receiving transmissions are sent to a satellite, which are then sent to a hub where the transmissions are sent over the Internet, as shown in the following graphic.

How you configure the ICS host computer depends on whether it connects to the Internet using an analog modem or ISDN connection, or a high-speed device such as a DSL or cable modem. Note

The ICS host computer automatically assigns IP addresses, forwards DNS names to the Internet for resolution, and assigns itself as the default gateway for connecting to the Internet. If any clients on the remote office s intranet are providing these functions, Internet Connection Sharing might not work.

Configuring an ICS computer with an analog modem or ISDN connection In this configuration, the ICS computer connects to the Internet using an analog modem or ISDN connection. The ICS computer and all other computers in the branch office are connected to that office s intranet using network adapters. Figure 25-7 shows how an Internet connection is shared using an analog modem or an ISDN connection.

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