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model designed for interprocess communication. Another facet of this model is .NET XML Web services. Although .NET XML Web services allow you to expose .NET Framework objects to any client that can use HTTP, .NET Remoting is optimized for .NET-to-.NET communication. Communication between the client and the remotable object can take place using SOAP or binary payloads transported over HTTP or TCP. .NET Remoting can transfer any serializable CLR types; it is not limited to XML Schema Definition (XSD) types or complex custom types as rendered by the .NET XML serializer. This chapter illustrated the key features of the .NET Remoting system and showed you how to set up a remotable object that exposes nontrivial functionalities. In particular, you learned how to expose JPEG images through XML documents. Of course, if the goal of your distributed system is simply to create and return dynamic images, .NET Remoting might not be for you. But from a broader standpoint that encompasses Web services, .NET Remoting not only makes sense, it is also compelling. The example we've constructed in this chapter has two aims. First, it demonstrates that .NET Remoting and Web services are just two remoting interfaces and that the same core class can outfit both. Second, it shows that to come up with truly efficient and effective code, you must always take the most appropriate route and create specialized code instead of pursuing the promises of code universality and platform independence. This chapter covered only the first side of remoting .NET Remoting for CLR types. In 13, we'll look at Web services a truly interoperable infrastructure ideal for rolling up your functionalities and making them available to a potentially infinite set of clients.

Because policy can be set at several levels, when you look at a policy object, what you see is both local policy and the policy in effect on the system. Local policy and actual policy in effect may not be synonymous if the computer is inheriting settings from domain-level policies. If you make a policy setting and it isn t re ected in effective policy, a policy from the domain is overriding your setting. It s also possible that the policy change hasn t been refreshed since the change was made. To force a policy refresh for the local computer, open a Command Prompt window and type the following:

FIGURE 5-17 Keep in mind how your Explanation headlines will become the foundation for a visual story

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A valuable feature, new in the Group Policy Management console, is the ability to back up and restore GPOs. Include regular backup of all GPOs as part of your overall planning-fordisaster strategy. To back up a GPO, follow these steps:

Open the Group Policy Management console. In the console tree, navigate to Group Policy Objects in the domain that contains the GPO to be backed up. To back up a single GPO, right-click the GPO and select Back Up. To back up all GPOs in the domain, right-click Group Policy Objects and select Back Up All (Figure 20-12).

Although this chapter touched on all the key aspects of the .NET Remoting technology, it revealed only the tip of the iceberg. Throughout the chapter, I've noted several aspects of .NET Remoting whose coverage was simply beyond the scope of a book about XML. Principal among the resources that cover these topics in more detail is the MSDN .NET Framework documentation, but many other appropriate resources are also available. I mentioned that Windows XP and newer systems boast a modified loader that looks directly into the source Portable Executable (PE) file to find .NET Framework-specific metadata. To understand the entire loading process of managed executables in Windows XP as well as in Windows 2000, I know just one resource: Jeffrey Richter's excellent book Applied Microsoft .NET Framework Programming (Microsoft Press, 2002). In the October 2002 issue of MSDN Magazine, you can find an article of mine that, like this chapter, attempts to explain the ABCs of .NET Remoting. In that article, you'll find a deeper discussion of architectural aspects channels, formatters, and sink chains than we've covered here. The internal engine that performs memory management for instances of remote objects is the lease manager (LM). Jeff Prosise, in 15 of his book Programming Microsoft .NET (Microsoft Press, 2002), explains a lot about it. Finally, if you're just looking for a complete .NET Remoting book, here it is: Microsoft .NET Remoting, by Scott McLean, James Naftel, and Kim Williams (Microsoft Press, 2002).

2. 3.

Breaking up the explanation of each Key Point headline into smaller pieces that you will show and narrate reduces cognitive load across a sequence of slides. This aligns with the research-based temporal contiguity principle, which explains that people learn better when animation and narration are presented simultaneously. For example, if you were to show an entire diagram rst and then the narration later, you would split the attention of your audience as their working memory struggles to coordinate what it sees and what it hears. The story template ensures that you break up every explanation into digestible pieces, so you end up tightly coordinating what you say and what you show, one idea at a time. You can organize your ideas within the cells of the Explanation column in any number of ways, such as the checklist structure in the preceding example, a chronology, a list, a 1-2-3 sequence, or any other way you might explain an idea in three parts.

In the Back Up Group Policy Object dialog box, type the path to the backup location and then click Back Up. After the operation completes, click OK.

The term Web service is relatively new, but the idea behind Web services has been around for a while A Web service is an interface-less Web site designed for programmatic access This means that instead of invoking URLs representing Web pages, you invoke URLs that represent methods on remote objects Similarly, instead of getting back colorful and animated HTML code, you get back XML Schema Definition (XSD) data types packed in XML messages Aside from these higher-level differences, the underlying models for a Web site and a Web service are the same In addition, any security measure you can implement on a Web site can be duplicated in a Web service To summarize, the Web service model is just another programming model running on top of HTTP A Web service is a software application that can be accessed over the Web by other software.

to protect data that might have to be restored one day, be sure that the backup folder is secure and can be accessed only by authorized administrators.