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Figure 2 5: Make sure you choose which file format you want to use, regardless of the file extension you type in the File Name box. 3. In the File Name box, enter a name for the file you're creating. 4. Select the option for the export range you want: To back up the entire registry, select the All option. To back up the selected branch, select the Selected Branch option. 5. In the Save As Type list, click the type of file you want to create: Registration Files (*.reg), Registry Hive Files (*.*), Text Files (*.txt), or Win9x/NT4 Registration Files (*.reg). 6. Click Save. Importing a file into the registry is similar to opening a file. Click File, Import; in the Files Of Type list, click the type of file that you're importing; then, in the File Name box, type the path and name of the file you're importing. The following sections describe each of the file types that you see in the Save As Type and Files Of Type lists. Each type is a different file format and thus suited to different purposes than the other types.

Microsoft introduced dynamic disks with Windows 2000, and Windows XP Professional supports dynamic disks. Instead of using partitions, you can divide dynamic disks into dynamic volumes, which support features that basic disks do not, such as the creation of more than four partitions per disk and volumes that span multiple hard disks. You can extend partitions on dynamic disks, provided that contiguous disk space is available. However, partitions on basic disks cannot span multiple hard disks. Windows stores partition information for basic disks in the partition table, which is not part of any operating system (it is an area of the drive that is accessible by all operating systems). Other configuration options, such as drive letter assignments, are controlled by the operating system and are stored in the Windows Registry. Basic disks are generally sufficient for a computer with a single hard disk. Also, if a computer is configured to start multiple operating systems, you must use basic disks instead of dynamic disks.

It is always best for queries to use a WHERE clause because this will restrict the number of results returned and thus enable the query to perform faster. Searchable arguments, also known as SARGs, refer to a WHERE clause that compares a column to a constant value or a variable. This enables the query optimizer to take advantage of an index, which is better than executing a table scan. A table scan should be avoided whenever possible because it indicates that no indexes will be utilized and the database engine will need to scan the entire table. If you encounter a query that is performing poorly, take a look at whether it is using a search argument properly. If it is not, then determine whether the query can be rewritten. You can do a quick check to see what type of operation will be performed by selecting Display Estimated Execution Plan from the Query menu. The query optimizer will attempt to resolve a query so that it utilizes a search argument whenever possible. For example, if you were to display the execution plan for the following query, you would see that it utilizes a clustered index seek:

Figure 4-3

The linked task will execute if the prior task completes. It does not matter whether the prior task completes successfully or completes with a failure. The linked task will execute if the prior task fails.

An administrator account is a user account that lets you make changes that affect other users. Administrators can change security settings, install software and hardware, and access all files on the computer. Administrators can also make changes to other user accounts. When you install Windows Vista, you specify an administrator account. A built-in administrator account also exists but is disabled by default. You can create additional administrator accounts on the computer, but they are not the same as the built-in administrator account. The built-in administrator account might not be protected by User Account Control (UAC), and you should enable and use it only when it is absolutely necessary. 5, User Account Control, discusses UAC in detail. Unlike previous versions of Windows, the administrator account that you specify during Windows Vista installation is an ordinary administrator account and not the built-in account that has special privileges.

' VB ' Create an instance of the RSA algorithm object Dim myRSA As RSACryptoServiceProvider = New RSACryptoServiceProvider ' Create a new RSAParameters object with only the public key Dim publicKey As RSAParameters = myRSA.ExportParameters(False) // C# // Create an instance of the RSA algorithm object RSACryptoServiceProvider myRSA = new RSACryptoServiceProvider(); // Create a new RSAParameters object with only the public key RSAParameters publicKey = myRSA.ExportParameters(false);