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You have constructed a nice shell, but the shell is rather empty at this moment. You need to access weather data in order to populate the shell. To accomplish this, you will learn to consume Web services. But first, what is a Web service A Web service is an application that runs on a Web server such as Internet Information Services (IIS). A Web service has a series of exposed public methods that an application can call. You ll find numerous examples of Web services on the Internet. You can use Web services that perform a variety of operations, such as finding a ZIP code, viewing a map, buying movie tickets, looking for information on search engines such as MSN or Google, and accessing weather information like your application will soon do. In the .NET world, classes and wizards are available to help you consume Web services. There are two popular implementations of Web services in use on the Web: SOAP and REST. SOAP Web services use XML to send messages and return results. All objects are serialized (the messages are sent as a series of bits and pieces over the Internet) and are then deserialized on the other side into objects. The beauty of XML Web services is that they can be hosted and consumed on any operating system and developed in any language. Because they use a series of standardized protocols and rules, XML Web services promote interoperability and efficiency. The future of the transacted world over the Internet lies in big part with the success of Web services.

est, a server that contains a writable copy of the Active Directory database, participates in Active Directory replication, and controls access to network resources. Administrators can manage user accounts, network access, shared resources, site topology, and other directory objects from any domain controller in the forest. See also Active Directory; authentication; directory; shared resource.

An implementation of DFS in which DFS topological information is stored in Active Directory. Because this information is made available on multiple domain controllers in the domain, domain DFS provides fault-tolerance for any distributed file system in the domain. See also fault tolerance.

11

A security or distribution group that can contain universal groups, global groups, other domain local groups from its own domain, and accounts from any domain in the forest. Domain local security groups can be granted rights and permissions on resources that reside only in the same domain where the domain local group is located. See also domain tree; forest; global group; security group; universal group. The name given by an administrator to a collection of networked computers that share a common directory. Part of the Domain Name System (DNS) naming structure, domain names consist of a sequence of name labels separated by periods. See also domain; Domain Name System (DNS).

A computer configuration that can start two different operating systems. See also multiple boot; startup environment.

DVD decoder A hardware or software compo-

note If the domain user account that you used to log on to the domain does not have administrative privileges on the local machine as well, a dialog box will appear. This dialog box prompts you to enter the user name and password of a local account that does have administrative privileges, which allows you to make changes to user accounts.

nent that allows a digital video disc (DVD) drive to display movies on your computer screen. See also digital video disc (DVD); DVD drive; hardware decoder; software decoder.

DVD drive A disk storage device that uses dig-

ital video disc (DVD) technology. A DVD drive reads both CD-ROM and DVDs; however, you must have a DVD decoder to display DVD movies on your computer screen. See also digital video disc (DVD); DVD decoder.

User Accounts gives you a simple way to add, remove, and manage local user accounts. You can also reset passwords. Keep in mind that these accounts only affect the local computer, not the domain. Users with a valid domain name and password can still log on to the domain at the local computer using that name and password. Any user who wants to log on to the local computer but not the domain, however, must have a valid user name and password configured in User Accounts on the local machine. On the Advanced tab, shown in Figure 11-11, you can manage passwords. This option allows you to use different passwords to access other network resources during the

An alternative keyboard with a layout that makes the most frequently typed characters more accessible to people who have difficulty typing on the standard QWERTY layout.

You will need to be connected to the Internet to follow the steps in the rest of the chapter; otherwise, nothing will work from this point on, especially in the next section because that s where you re communicating with the Web service.