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As you can see in the source code, one of the ManipulateStrings arguments, myString, is passed with the ref keyword. When you have an argument that is passed to a method by reference, the called method is receiving a reference to the same memory location used by the caller. Therefore, if the method is modifying the content of that argument, it is modifying the content at this memory location and thus modifying the variable from the caller. In this case, anything that is done to the myString argument will modify the value of the variable in the calling code. The other argument is myPosition, and it is passed by value. When you have an argument that is passed by value, the method is receiving a copy of the variable from the calling code and thus can t modify the original value from the caller. Therefore, the content will get lost when the method ends and the execution flow returns to the caller.

You can add remote connections to Network Bridge at any time by right-clicking the Network Bridge icon and choosing Properties. The Network Bridge Properties dialog box appears, as shown in Figure 3-13. You can only have one network bridge on a Windows XP computer, but the bridge can support multiple connections (up to 64).

The settings in the Advanced menu of the Network Connections folder allow you to choose from a range of advanced settings, including operator-assisted dialing, dial-up preferences, bridge creation (Layer 2 connectivity), and network identification options. Another option

25:

allows you to install optional networking components such as the Simple Network Management Protocol (SNMP) service or the printing service. You can also modify the order in which connections are used by network services, or the order in which your computer uses network protocols and providers.

Figure 3-12. The Tiles view shows the network bridge and its two connections, and provides brief status information as well.

If you choose this setting, automatic dial-up settings can be overridden where intervention is required. Typically, you can use this setting where you have to call by using a manually operated switchboard to establish your dial-up connection.

The settings in Dial-up Preferences affect connection creation privileges, Autodial options, and callback options. You can enable or disable Dial-up Preferences on your users desktops by using the Enable the Dial-up Preferences item on the Advanced menu Group Policy setting. Autodial The Autodial tab on the Dial-up Preferences page lists the available locations where you can enable Autodial. Autodial maps and maintains network addresses to connection destinations, which allows the destinations to be automatically dialed when referenced, whether from an application or from a command prompt. To enable Autodial for a location, select the check box next to the location. To disable Autodial for a connection, clear the check box next to the location. The following is an example of how Autodial works: 1. You are not connected to your ISP, and you click an Internet address that is embedded in a word processing document. 2. You are asked to choose the connection used to reach your ISP, that connection is dialed, and then you access the Internet address. 3. The next time you are not connected to your ISP and you click the Internet address in the word processing document, the connection that you selected the first time is automatically dialed. The Autodial feature works only when the Remote Access Auto Connection Manager service is started. Remote Access Auto Connection Manager is installed by default in Windows XP Professional based computers that are not members of a domain and in Microsoft Windows XP Home Edition. To start the Remote Access Auto Connection Manager service 1. Right-click My Computer, and then click Manage. 2. In the console tree, double-click Services and Applications, and then click Services. 3. In the details pane, right-click Remote Access Auto Connection Manager, and then click Start.

Part IV:

Figure 3-13. You can manage the bridged adapters from the General tab of the Network Bridge Properties dialog box.

Callback The Callback tab on the Dial-up Preferences page provides you with cost advantages. Callback instructs your dial-up server to disconnect your initiating call after authenticating your credentials and then call you back, thereby reducing your phone charges. Callback behavior is determined by a combination of the settings that you specify in Network Connections, and by the user account settings you designate. Table 25-2 illustrates callback behavior based on these settings.

Table 25-2