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The Stocks icon looks like a blue-and-gray stock ticker. Tap it to go to the application that monitors your favorite stocks using 20-minute delayed data from Yahoo!. The Stocks screen, shown in Figure 11-14, consists of a list of stocks above a historic graph. Current prices appear to the right of each name, with the changes listed in green (positive) or red (negative). From this screen, you can view and customize stock information as follows:

These goals are what you d expect from a framework: simplicity, extensibility, community involvement, and powerful tools. Let s start using the framework!

Installing CouchDB on Fedora Linux is very simple thanks to the inclusion of the YellowDog Updater, Modified (yum). This command-line based software management utility will automatically update itself before fetching the requested software and any dependency packages required. I am installing CouchDB on Fedora 11, but the process should be the same for earlier versions of Fedora. The first thing you will need to do is open a Terminal window. You can find the Terminal application in Applications System Tools Terminal, as shown in Figure 2-4.

Before you use Safari, you need to have a Wi-Fi connection. You cannot connect to the Internet without it.

Figure 2-4. Opening Terminal in Fedora Linux You will now tell the yum application to install the couchdb package. It is highly likely that you are logged in to Fedora as a standard user and hence will not have sufficient privileges to install packages with yum. There s no need to log out, however; we can use the su command to run a shell command as the root user. Issue the following command in your Terminal window to begin the installation process:

So far in this chapter, we ve touched on the XMLHttpRequest object and some of the Ajax patterns used when developing richer, more interactive web applications. We ve also examined the ASP.NET AJAX architecture and the different development scenarios that rationally emerge from its design. It s time to apply some of this knowledge and walk through a few quick applications that demonstrate how to build pages with ASP.NET AJAX. The following sections move rather quickly, because they re intended to give you a whirlwind tour of the framework. Subsequent chapters will dissect and explain each of the topics more carefully. Let s begin the tour.

You can tell at an instant whether your Wi-Fi connection is up and running. Look at the very top-left corner of your screen. When you see the three semicircle-like arcs next to the word iPod, as shown in Figure 3-1, you have a live connection. When the arcs are more blue (and less black or gray), you have the strongest connection possible. Three blue arcs are ideal. One or more black or worse, gray arcs mean that your connection is weak. Try moving closer to the Wi-Fi source. Make sure that you re not obstructing the antenna. Remove your fingers from around the Wi-Fi antenna on your iPod. The small, black rectangle on the back of your unit shows you where that antenna lives. That s the bit you want to avoid blocking with your hands and body.

$ su c 'yum install couchdb' You will be asked for a password. Enter your system administrator (root) password and hit Enter. yum will search for any dependencies, before presenting a summary of what package and prerequisites are to be installed. It will ask you to confirm before the installation starts, as shown in Figure 2-5.