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Important See the Policy Removal Considerations section of this lesson for details on selecting a policy removal option.

Table 15-7.

We ll start by explaining what sequences are and how they are used in LINQ queries. You ll also encounter query expressions. This is the name for the from where select syntax you ve already seen. We ll explore query operators, which represent the basic operations you can perform in a LINQ query. We ll also explain what deferred query execution means, and why it is important. In order to enable deferred query execution, LINQ uses expression trees. We ll see what expression trees are and how LINQ uses them.

9. Choose one of the following options (available for the My Documents folder only) in the My Pictures Preferences area:

Provides a way to sign a script with a digital signature and verify the signature Exposes properties that specify the path of the running scripting host (Wscript.exe or Cscript.exe), its arguments, and the working mode (interactive or batch); also provides methods to create and read objects Returns a pointer to the collection of command-line parameters Provides access to a method for creating a script to run on a remote computer Retrieves system environment variables Provides access to the named command-line parameters in the WshArguments object Maps the network, making it easy to connect and disconnect remote drives and printers Provides access to the remote script process Exposes error information that results when a remote script ends in error Provides information about a script run with the Exec method Starts new processes, creates shortcuts, and provides the Environment collection to handle environment variables such as SystemRoot, Path, and Prompt Creates an object reference to a shortcut Accesses the Windows shell folders such as the Desktop folder, the Start Menu folder, and the My Documents folder Provides access to the unnamed command-line parameters in the WshArguments object Creates an object reference to a URL shortcut

Make My Pictures A Subfolder Of My Documents, to redirect My Pictures automatically to remain a subfolder of My Documents. This option is enabled by default and is recommended. Do Not Specify Administrative Policy For My Pictures, to remove My Pictures as a subfolder of My Documents and have the user profile determine the loca tion of My Pictures. With this option, the location of My Pictures is not dic tated by Group Policy and a shortcut takes the place of the My Pictures folder in My Documents.

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10. Click OK. To redirect special folders to a location according to security group membership, com plete the following steps: 1. Open a GPO linked to the site, domain, or OU containing the users whose special folders you want to redirect to a network location. 2. In User Configuration, open Windows Settings, then double-click the Folder Redi rection node to view the folder you want to redirect. 3. Right-click the folder you want (Application Data, Desktop, My Documents, or Start Menu), and then click Properties. 4. In the Target tab in the Properties dialog box for the folder (shown previously in Figure 11-16), in the Setting list, select Advanced Specify Locations For Various User Groups, and then click Add. 5. In the Specify Group And Location dialog box (see Figure 11-18), in the Security Group Membership box, click Browse.

You need to understand these features in order to be able to read and write LINQ code, as we ll do in the next chapters.

One of the objects you will probably use often is FileSystemObject. This object gives you access to the files and folders on your computer. The following example, called FileProp.vbs, shows how to use this object; Figure 15-10 on the next page shows the result.

11-35

Figure 15-10. The FileProp.vbs script quickly displays some file properties that aren t easily viewed in Windows Explorer.

6. In the Select Group dialog box, type the name of the security group for which you want to redirect the folder, and then click OK. 7. In the Specify Group And Location dialog box, in the Target Folder Location list, select the redirect location you want for this GPO from one of the following: