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Figure 28-6. Smile opens PDF files in graphic windows, where you can make custom graphics. As you can see in Figure 28-6, the result returned (the value of w) is a graphic window.

And, because we forced a numeric comparison, once again they are equal. 102 OPERATORS AND EXPRESSIONS

I always knew that SQL databases were generally fast, but what surprised me was just how fast I could execute SQL commands with AppleScript in the middle. It would execute tens of operations per second, which may sound slow in SQL terms but is usually fast enough for AppleScript projects that don t need to access the database that often.

1. Technically, structs are derived from System.ValueType, but that s only an implementation detail. From a language perspective, they act as if they re derived from System.Object.

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Tightly coupled (clustered) architectures are a form of parallel processing. This refers typically to a cluster of machines that work closely together, running a shared process in parallel. The task is subdivided in parts made individually by each one and then put back together to make the final result. Peer-to-peer is clientless and has no single point of failure that can cause total failure. This type of architecture has no special machine or machines that provide a service or manage the network resources. Instead, all responsibilities are uniformly divided among all machines, known as peers. Peers can serve both as clients and servers.

When the CheckForUpdates call is made, Silverlight looks at the stored origin URI of the .xap file and makes a normal background HTTP request to that location to verify that the latest version is installed. If a new version is available, Silverlight will receive that in the background and programmatically indicate that a new version is available by setting the UpdateAvailable property to true in the returned event arguments class. Unless you prompt the user to shut down and relaunch the application, he ll still be running the old version. It s not until the next run that he ll execute the newly downloaded version. But, when you detect that a new version is available, you can display a dialog to the user and request a restart. If the nature of the application allows it, you can also be more draconian and completely block all of the UI functionality until the user restarts the application. What you can t do is force an application to restart programmatically. A best practice is to gently inform your user (perhaps soothing music and pastel colors will help) that a new version is available and let him restart at his convenience. At the worst, he ll get the new version during the next session. Once you ve decided to take your application out of the browser, one of the capabilities you ll enable is the notification API, introduced in Silverlight 4.

This printf() will get executed if mySecondInt is false. Do you see why If mySecondBool is false, then !mySecondInt must be true. The ! operator is a unary operator. Unary operators operate on a single expression. The other two logical operators, && and ||, are binary operators. Binary operators, such as the == operator presented earlier, operate on two expressions, one on the left side and one on the right side of the operator. The && operator is commonly referred to as the logical and operator. The result of an && operation is true if, and only if, both the left side and the right side are true. Here s an example:

Settings Property FormBorderStyle MaximizeBox MinimizeBox Size Text Value FixedSingle false false 150, 230 Pixel Values

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