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For paranoid software vendors, or for those who have a legitimate need to keep a tight rein on their installation base, there are solutions that involve regular access to hardware or services to confirm that previously installed software is legal and valid. One popular method uses a dongle, typically a USB port-based device that the software must have access to each time it runs. The software vendor supplies a dongle with the licensed software, and may encode it with date-based or use-based limits. With the prevalence of the Internet, software vendors also have the option of realtime verification over the Web. Each time the program runs, it could access a known vendor site to engage in a usage verification process. Such a system allows for ongoing monitoring of the software by vendors who may have a business or governmental reason to limit use of the software. For one of my customer projects, I must access a third-party web site on a monthly basis and download proprietary data for use with that vendor s software. The vendor requires that I always access their web site from a specific machine with a specific IP address. It will refuse to supply the data if I attempt to connect from any other machine. If I have a real need to use a fresh IP address (if, for example, I change Internet service providers), I must submit paperwork to the vendor informing them of the new IP address. It seems pesky, and it is an irritation. But the data they supply is unique and valuable, and they feel they have a business need to protect that investment. Since my customer requires the data, I have no choice but to comply with the monthly verification procedures.

Now, let s say that the user executes the following command line:

We ve already seen the XMLHttpRequest object in action in chapter 2 and earlier in this chapter. The differences between reading and updating are minor from the client code s point of view. We simply need to specify the POST method and pass in our form parameters. Listing 5.12 shows the main code for our ContentLoader object developed in section 3.1. We have refactored it to allow parameters to be passed to the request, and any HTTP method to be specified.

This is simply an overview of the WCF Data Services client library (System.Data.Services.Client). This library can do many things. For more information, see Using a Data Service in a Client Application (http://msdn.microsoft.com/en-us/library/dd728282.aspx).

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Click Next and the wizard will start detecting your current network and locating your router. When it completes, you ll see the page shown in Figure 7-45.

You could apply these queries to a REST API query to return all shirts with the description A Red Shirt . The URI would look like this:

Example C-12. The markup for Exercise 3-3 (continued)

On a mobile device, space available to present information is limited, so you must carefully think through how information is presented to the user. Consider the overall function of your application and decide how best to organize and order the information so that it is convenient for the user. Consistency is important. Use colors, graphics, and icons consistently. Use them in a way to support the user s ability to perform a task or extract some information. Avoid overuse of graphics that instead cause distraction. Do not use icons to replace essential information conveyed as text. Consider whether to present your application in portrait or landscape this will depend largely on the specifics of your application design. In a movie application, for example, it might make sense to force the user to use a landscape layout since this better fits the native aspect ratio of the movie. In many cases it may be better to support both portrait and landscape and let the user select either by physically rotating the device or using other methods.

The default web part settings allow the user to save changes (within the web part, not within the data source), connect to a data source, edit queries, and engage in other random acts of mischief. You can lock down the web part to keep your users from modifying your web part. When you set LockedDown to True, the web part you create will have the following modifications: The Connect to Data toolstrip (the menu above the toolbar) command will be hidden The Save toolstrip command will be hidden The Edit Query and Delete Query commands on the context menu will be disabled

When a client attempts to connect to the socket listener, the acceptAndOpen() method verifies that the connection can be established and opens a StreamCon-

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