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At the time of this writing, the latest version of Windows Messenger supports making phone calls to a regular telephone number For example, you can use Windows Messenger to call your mother across the country, using the Internet instead of a long distance telephone service Again, you won t have the same quality that you find with a standard phone call, but it is certainly worth experimenting with Another big advantage is that the party you re calling doesn t need a computer or computer expertise to configure Windows Messenger you can reach anyone who has a telephone To use Windows Messenger for calling telephone numbers, make sure you have the latest version Visit http://messengermicrosoftcom to download and install the latest version that supports the phone call feature.

23:

Windows-based computers communicate with each other on peer-to-peer networks by using a common protocol. As a result of the dominance of the Internet, TCP/IP has become the protocol of choice for peer-to-peer networks. For more information about configuring protocols for peer-to-peer networking, see TCP/IP and Other Network Protocols later in this chapter.

A domain is a logical grouping of networked computers that share a central directory database that contains user account and security information for resources within the domain. In a domain, the directory database is stored on computers that are configured as domain controllers. A domain controller manages all security-related aspects of interactions between users and domains. Security and administration are centralized. Figure 23-2 illustrates a domain configuration. In a domain that has more than one domain controller, the domain accounts database is replicated between domain controllers within the domain for increased scalability and fault tolerance. If a domain controller becomes unavailable, directory information is still available from the other domain controllers. For more information about Windows 2000 Server domain controller placement in a Windows 2000 domain, see Designing the Active Directory Structure in the Deployment Planning Guide of the Microsoft Windows 2000 Server Resource Kit. For more information about Windows Server 2003 domain controller placement, see the Microsoft Windows Server 2003 Deployment Kit. Windows 2000 and Windows Server 2003 domains improve on Windows NT domains. In Windows 2000 and Windows Server 2003 domains, all domain controllers can receive updates to the directory database. In Windows NT domains, the single-master model allows only one domain controller to be updated, which then replicates the changes to the other domain controllers. In Windows 2000 and Windows Server 2003 domains, the directory is distributed and it uses a hierarchical namespace based on the Domain Name System (DNS). In Windows NT domains, the directory is centralized and a flat namespace is used. Windows XP Professional is fully compatible with Windows NT, Windows 2000, and Windows Server 2003 domains. For more information about whether to migrate an existing Windows NT domain to Windows 2000, see Determining Domain Migration Strategies in the Deployment Planning Guide.

Once you have the latest version installed, choose Actions, Make A Phone Call, or click Make A Phone Call in the bottom pane of Windows Messenger Windows Messenger opens the Phone dialog box Check your computer to see whether you are currently subscribed to a voice service provider If not, you ll see the phrase Sign Up For Voice Service Today and a Get Started Here button Click the button to open the Select A Voice Service Provider window and compare the available calling plans You must sign up with a voice provider to use the computer-to-telephone feature of Windows Messenger Although there is no charge to initiate these calls from your computer beyond your standard ISP account cost, eventually your calls must be routed into the telephone system at the destination, and you must pay for this segment of the communications link Voice service providers include Net2Phone (wwwnet2phone.

Part IV:

Figure 23-2