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FileMerge features Let s look at some of the features of the FileMerge program. In addition to comparing files, you can compare and merge all files within two directories. Another useful feature is the Filter option, located in the Preferences dialog box, which enables you to apply a program to the files you are comparing before they are evaluated. Some predefined filters are available or you can write your own. For example, imagine you wish to diff comments from two source files but exclude any code. You can write a program to accomplish this (or better yet, use UNIX commands) and apply it to the files before FileMerge compares the programs. Ancestor files permit FileMerge to intelligently resolve file differences in creating merged versions of files. If two people begin with the same file (a common ancestor) and make independent modification to each version, FileMerge can use the extra information from the ancestor of both files to make better choices when merging the differences. The best way to lean about FileMerge s other features is to fire it up and begin using it in your work.

You re now taking advantage of some of the Python modules available to you under GAE in order to make the coding a lot simpler. You ve created a GameController class, which for now is being instantiated when you receive a request. It s the entry point of your web service that basically provides the methods you need in order to handle the various requests around the game play. In this case, you ve implemented only a get() method. This is very convenient when testing from the web browser, because it always sends GET requests when entering a URL in the address field. As you start to make these requests from the iPhone client, you ll embrace a more RESTful approach, which means that you ll use GET requests for getting data, POST for creating data, PUT for updating, and DELETE for deleting data. This will make you a good citizen of the modern Web 2.0 world. To test the previous code, type http://localhost:8080/ opponent=Garry%20Kasparov in the address field of your browser. The result should look like Figure 2-11.

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positions you might have expected and the Text Fields are blank. Also, nothing happens when you change any of the Sliders or the Text Fields. What s happened here Quit the program and let s look at the code. The first thing that happens in the program is in the awakeFromNib method (Listing 7 3).

In this chapter we explain how you can write your own data access objects, HTTP modules for ASP.NET session management, and various other useful infrastructure-related components. Understanding how to do this is great, but you don t have to write this code yourself. Many people have done this for you already! Existing NHibernate libraries take care of much of the hard work, and include the best practices described here. After reading this section, we encourage you to research some of those libraries, including NHibernate Burrow, Castle ActiveRecord, Rhino Tools, and S#arp Architecture. Even if you decide not to use any of them, you can learn a great deal by browsing the code of these libraries.

Basic authentication is an industry authentication standard; however, the password is Base64 encoded before it is sent over the network. Base64 encoding is not an encryption algorithm, so it can be easily decoded. This means that someone on your network could use a network sniffer to intercept and decode the password. The final option in the Authentication Methods dialog box is .NET Passport Authentication, which is new to IIS 6. This option allows you to follow a standard security model; the authentication of your user accounts is managed by one source. All that is required is that you register as a Passport realm, and then you can begin using Passport for authentication. Before IIS 6, you had to download the Passport SDK and write many lines of ASP.NET code to be able to use Passport; now, all you have to do is select the checkbox in this dialog box. With .NET Passport authentication, when users request a page, they are first redirected to the .NET Passport logon page. After they are authenticated, they are redirected to the page they originally requested. Once authenticated, IIS AUTHENTICATION 93

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