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Add a new, empty class to the project called ReviewServicevb This is the local service that will act as the intermediary between the workflow and a Windows form The first step is to define the interface and to add the ExternalDataExchange attribute to the interface That way, the workflow knows this interface defines the communication between the class and the workflow To do this, add the following code above the Public Class declaration (at the top of the code page): <ExternalDataExchange()> _ Public Interface IReview Function CreateReview(ByVal Reviewer As String, ByVal Reviewee As String) As Boolean End Interface This code defines the interface called IReview with a function called CreateReview The workflow uses this interface to create an initial performance review, and accepts two parameters: Reviewer and Reviewee The interface is now defined, but there s no code associated with the interface.

Steganography is the study of techniques for sending sensitive information that attempt to hide the fact that sensitive information is being sent at all Steganographic techniques typically use a covert channel to send sensitive information from one party to another For example, consider the following message that Alice could send to Bob: All the tools are carefully kept This message may seem harmless enough, but within the message there is a covert channel that is used to send a secret message The covert channel is made up of the first letter of each word in the message, and the first letter of each word spells Attack There are many other examples of steganography for example, invisible ink pens that children use to send messages to each other Authorities have speculated that videos of Osama Bin Laden raising a glass or conducting other actions may have meant something to his followers.

The Window object supports basic window functionality. If your application does not use navigation, it is good to use this type of object as opposed to NavigationWindow (see the next section) because it has less overhead and uses fewer system resources than a navigation window. However, your application can use both, so an application that uses NavigationWindows can still use Window objects for secondary windows or dialog boxes that don t require navigation support.

If that is true, then Osama Bin Laden was using another form of steganography There are also other digital approaches to steganography For example, hidden messages can be transmitted as part of electronic images Each pixel in an image can be represented as an 8-bit color code, corresponding to a red, green, and blue (RGB) value for that pixel The first (or most significant) bit of each of the 8-bit components has the most significant effect on the color of the pixel However, the least significant bit has only a very slight effect on the color of the pixel One could change all of the least significant bits without affecting the average person s perception of an entire image One could then use these bits to transmit a secret message.

To do this, change the public class declaration for ReviewService to the following: Public Class ReviewService: Implements IReview When you do this, a function definition for CreateReview will automatically be created If the definition isn t automatically created, use the following code to define the sub: Public Function CreateReview(ByVal Reviewer As String, ByVal Reviewee As String) As Boolean Implements IReviewCreateReview Within this definition, notice the parameters are listed as they were in the interface and at the end of the definition line as Implements IReviewCreateReview This code shows that this function is going to implement the function CreateReview that was defined within the interface For a simple example, add the following code to the CreateReview function: Msgbox("Reviewer: " & Reviewer) Return True The ReviewService.

For example, if you switched the least significant bit of one of the RGB values of a black background pixel in a digital image from the value 000 to 001, you would be able to transmit the.

The API of the Window object supports properties, events, and methods that you can use to control how the window appears and how it responds to user interaction. Some of these actions control creating, closing, showing, and hiding the window. You can also control its size and position through properties. Many of the window s adornments, including the style, caption, status bar, and taskbar icon, are available via the Window object API. Additionally, changes in window state and location can trigger custom code through event handlers associated with them.

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