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Flexible, secure authentication and authorization Active Directory authen tication and authorization services provide protection for data while minimizing barriers to doing business over the Internet. Active Directory supports multiple authentication protocols, such as the Kerberos version 5 protocol, Secure Sockets Layer (SSL) version 3, and Transport Layer Security (TLS) using X.509 version 3 certificates. In addition, Active Directory provides security groups that span domains. Security integration Active Directory is integrated with Windows Server 2003 security. Access control can be defined for each object in the directory and on each property of each object. Security policies can be applied locally, or to a spec ified site, domain, or organizational unit. Directory-enabled applications and infrastructure Features within Active Directory make it easier for you to configure and manage applications and other directory-enabled network components. In addition, Active Directory provides a powerful development environment through Active Directory Service Interfaces (ADSI). Interoperability with other directory services Active Directory is based on standard directory access protocols, including Lightweight Directory Access Proto col (LDAP) version 3, and the Name Service Provider Interface (NSPI), and can interoperate with other directory services employing these protocols. Because the LDAP directory access protocol is an industry-standard directory service protocol, programs can be developed using LDAP to share Active Directory information with other directory services that also support LDAP. The NSPI protocol, which is used by Microsoft Exchange Server 4 and 5.x clients, is supported by Active Direc tory to provide compatibility with the Exchange directory. Signed and encrypted LDAP traffic By default, Active Directory tools in Win dows Server 2003 sign and encrypt all LDAP traffic by default. Signing LDAP traffic guarantees that the packaged data comes from a known source and that it has not been tampered with.

var processes = Process.GetProcesses() .Where(process => process.WorkingSet64 > 20*1024*1024) .OrderByDescending(process => process.WorkingSet64) .Select(process => new { process.Id, Name=process.ProcessName });

MsgBox strMsg, vbOKOnly, "File Properties"

For those readers already familiar with the features of Active Directory for Windows 2000, a detailed listing of the new Active Directory features available in the Windows Server 2003 family is located in Appendix A, New Active Directory Features in the Windows Server 2003 Family.

Finally, the script releases the File object and the FileSystemObject object by setting the variables to the built-in value Nothing, which releases the resources used by the objects. It s not important to do this in a small script such as this one because it happens anyway when the script ends, but in more involved scripts, releasing the objects when you ve finished with them can reduce the resources your script requires.

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To precisely understand what happens under the covers, let s analyze this code step by step, in the order the processing happens. We ll start by looking at IEnumerable<T>, a key interface you ll find everywhere when working with LINQ. We ll also provide a small refresher on iterators and then stress how iterators allow deferred query execution.

The data stored in Active Directory, such as information about users, printers, servers, databases, groups, computers, and security policies, is organized into objects. An object is a distinct named set of attributes that represents a network resource. Object attributes are characteristics of objects in the directory. For example, the attributes of a user account object might include the user s first name, last name, and logon name, while the attributes of a computer account object might include the computer name and description (see Figure 1-2).

In this section, we present two sample scripts that demonstrate some of the techniques you can use with Windows Script Host.

Some objects, known as containers, can contain other objects. For example, a domain is a container object that can contain objects such as user and computer accounts. In Figure 1-2, the Users folder is a container that contains user account objects.

You might have an occasional need to disable Windows Firewall for a few moments to bypass its protections. This script provides an easy way to disable or enable the firewall. You could take the traditional path click Start, open Control Panel, open Security Center, open Windows Firewall, and then try to remember why you wanted to change the setting in the first place or you could simply double-click the desktop shortcut for a script like the one that follows.