Client machines describe a server request by creating specially formatted XML and then sending it typically using HTTP over an intranet or the Internet. Simple Object. Here the user probably filled out a Web form, which was sent back to the Web server.
In addition, the computers providing the services must be running an operating system that is listening for these SOAP requests. In the not too distant future, mobile phones, pagers, automobiles, microwave ovens, refrigerators, watches, stereo equipment, game consoles, and all kinds of other devices will also be able to participate in this new world.
Of course, Microsoft hopes that people will write applications that take advantage of the rich feature set in Windows, but again, Windows is a recommendation, not a necessity. NET initiative is all about making it really easy for developers to create and access these services. Now we, as application developers, can concentrate and focus on our business logic and services, leaving all the communication protocols and plumbing to Microsoft who has a lot of developers that just love to do this nitty-gritty stuff.
When I first. It really seemed to me that they had a vision and a plan and that they had rallied the troops to implement the plan. But I really believe in the Microsoft. So, what exactly constitutes the Microsoft. NET initiative? Because these Web services and applications that use Web services run on computers and because computers have peripherals, we still need an operating system. Microsoft suggests that people use Windows.
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NET Server Family will be the versions best suited for this new service-driven world. Specifically, Windows XP and the Windows. Passport is a service that authenticates users. Many Web services will require user authentication to access information securely. When users log on to a computer running Windows XP or one of the servers from the Windows. As you can imagine, Passport is a huge benefit to users: one identity and password for everything you do, and you have to enter it only once! In addition, Windows XP and the Windows.
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NET Server Family products have some built-in support for loading and executing applications implementing the. Finally, Windows XP and the Windows. NET Server Family operating systems have a new, extensible instant messaging notification application. This application allows third-party vendors such as Expedia, the United States Postal Service, and many others to communicate with users seamlessly. For example, users can receive automatic notifications when their flights are delayed from Expedia and when a package is ready to be delivered from the U.
Postal Service. As part of the. NET initiative, Microsoft is providing several products that companies can choose to use if their business logic services find them useful. Certainly, Microsoft wants to do more than just provide the underlying technologies that allow others to play in this new world.
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Microsoft wants to play too. So, Microsoft will be building its own set of XML Web services: some will be free, and others will require some usage fee. Microsoft initially plans to offer the following. NET My Services:. NET My Services. Over time, Microsoft will add many more consumer services and will also be creating business-oriented XML Web services.
In addition to these public Web services, Microsoft will create internal services for sales data and billing. These internal services will be accessible to Microsoft employees only.
I anticipate that companies will quickly embrace the idea of using Web services on their intranets to make internal company information available to employees. The implementation of publicly available Internet Web services and applications that consume them will probably proceed more slowly.
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Some of the Microsoft. Even though this entire introduction has been geared toward building Internet applications and Web services, the. NET Framework is capable of a lot more. All in all, the. The material. NET Framework is the part of the initiative that makes developing services and applications really easy. And, most important, this is what this book is all about: developing applications and XML Web services for the. NET Framework, called the.
NET Datacenter Server will include the. In fact, this is how the Windows.
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NET Server Family got its name. NET Framework in all editions. NET Framework with your application, and your setup program will have to install it. Microsoft does make a. Almost all programmers are familiar with runtimes and class libraries.
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In fact, the Windows operating system itself can be thought of as a runtime engine and library. Runtime engines and libraries offer services to applications, and we programmers love them because they save us from reinventing the same algorithms over and over again. The Microsoft. NET Framework allows developers to leverage technologies more than any earlier Microsoft development platform did.
Specifically, the. NET Framework really delivers on code reuse, code specialization, resource management, multilanguage development, security, deployment, and administration. While designing this new platform, Microsoft also felt it was necessary to improve on some of the deficiencies of the current Windows platform. Of course, if you want to write a. NET Framework application that interoperates with existing, non-.
NET code, you must still be aware of these concepts. This situation occurs when components being installed for a new application overwrite components of an old application, causing the old application to exhibit strange behavior or stop functioning altogether. The architecture of the.
Framework now isolates application components so that an application always loads the components that it was built and tested with. If the application runs after installation, then the application should always run. Several files, registry settings, and shortcuts usually need to be created.
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