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The Windows Registry is actually a hierarchical database consisting of top-level keys called hives. (Named so because of their structural resemblance to beehives. You can really just think of these as folders since they work the same way, essentially, in that they are hierarchical containers.) These Windows Registry hives are composed of keys, subkeys, and value entries. The keys and subkeys are denoted by folder icons and work essentially the same as the folders you see in the Windows Explorer in that they contain other subkeys and values. The first four hives are the following: HKEY_CLASSES_ROOT HKEY_CURRENT_USER HKEY_LOCAL_MACHINE HKEY_USERS These four keys are always considered open. (HKEY, by the way, stands for Hive Key, so we can refer to these as hives or keys interchangeably.) An open key means that applications may add their own keys and data to these main hives. To see this structure, you can take a look at the Windows Registry by using the RegEdit utility provided with every Windows operating system.

Compared to other projects we did in our pasts of long-time software development, iTap was a small-scale project. We ll summarize the main challenges because, even for a small project like iTap, it is never wise to underestimate the quality requirements that are necessary to be successful.

To launch the RegEdit utility, click the Start button on your Windows start bar and then click Run. Type regedit into the Run dialog and click OK. The Windows RegEdit utility displays, as shown in Figure 3-4.

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Specifies what happens to the foreign key when the primary key is deleted: importedKeyNoAction: Do not allow deletion of the primary key if it has been imported. importedKeyCascade: Delete rows that import a deleted key. importedKeySetNull: Change the imported key to NULL if its primary key has been deleted. importedKeyRestrict: Same as importedKeyNoAction (for ODBC 2.x compatibility). importedKeySetDefault: Change the imported key to the default if its primary key has been deleted. Foreign key name (may be null). Primary key name (may be null). Specifies whether the evaluation of foreign key constraints be deferred until commit: importedKeyInitiallyDeferred: See SQL-92 for definition. importedKeyInitiallyImmediate: See SQL-92 for definition. importedKeyNotDeferrable: See SQL-92 for definition.

iPhones have really small screens. Even for applications like iTap, the screen is not very large if stuffed with all kinds of controls for settings, mouse buttons, special functions like scrolling, and so on. The solution was simply to make use of as many gestures as possible to provide the user with a good set of features while having the screen as empty as possible. It may not sound obvious, but an empty screen is exactly what we tried to achieve with iTap. Only a completely empty screen would provide the user with the possibility of moving the mouse cursor while looking at his TV screen (and not at his iPhone) and not accidentally hitting buttons at the same time. We designed iTap to be as easy to use as possible in the dark and without looking at it. Not only did this decision influence how the GUI was presented to the user, but we even restricted the application to not automatically rotate its GUI when the iPhone is rotated. It was quite logical to us that without looking at your device you would not want it to rotate automatically. Our feature set for the mouse controls always included at least left button and right button presses as well as moving the mouse and two-finger scrolling. Right button clicks

Figure 3-4. The Windows RegEdit utility If you double-click on one of the hives in the RegEdit utility, you will see that it will expand to include keys for all kinds of useful information and also a bunch of things that, at least at first, probably won t make a lot of sense. However, the information stored here is very relevant to the innumerable software applications and hardware installed on your computer. Checking values using the Registry Editor is very useful in itself, but it can be cumbersome and tedious to check it manually. It s good to know that you can easily write code to do so automatically, as you ll see in the next section.

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