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LDIFDE is a command-line tool in the Windows Server 2003 operating system. It is used to create, modify, and delete objects on computers running on Windows Server 2003 and Windows XP Professional. LDIFDE is also used to extend the schema, export Active Directory user and group information to other applications or services, and populate Active Directory with data from other directory services.

The Active Directory Migration Tool (ADMT) is used to migrate from an earlier implementation of Windows NT to Windows Server 2003 or Windows 2000 Server. ADMT supports not only migration from Windows NT 4.0 to Active Directory but also interforest and intraforest migrations. ADMT is designed to migrate an Active Directory schema from one forest to another, regardless of whether a change in operating systems is involved.
ADMT 2.0 has many new features such as a command-line interface and a better interface to work with Microsoft Exchange Server.

ADMT also supports a user-account password migration.

Following are the files included in the System State data:

• Boot files, including the system files and all files protected by Windows File Protection (WFP)
• Active Directory (on domain controller only)
• SYSVOL (on domain controller only)
• Certificate Services (on certification authority only)
• Cluster database (on cluster node only)
• Registry
• IIS metabase
• Performance counter configuration information
• Component Services Class registration database

DCPROMO  is a windows server os command which is used to promote / make normal windows server functionality to server functinaity as domain controller. It is used to install active directory on Windows OS. If you want to uninstall active directory from Windows again run dcpromo on RUN prompt.A domain controller can manage almost all resources in you network such as users ,PCs,Printers and etc.

Certificate revocation is the process of revoking a certificate before it expires. A certificate has an expiration date that defines the duration of the certificate’s validity. A certificate may need to be revoked when it has been lost or compromised, or when an employee to whom the certificate is issued has left the company.

Windows Server 2003 comes with many system services that have different functionalities in the operating system. When Windows Server 2003 is first installed, the default system services are created and are configured to run when the system starts.

Windows Server 2003 also has many additional optional services such as Certificate Services. These services are not installed during the default installation of Windows Server 2003.
The optional services can be added to existing Windows Server 2003 computers by using Add/Remove Programs or the Windows Server 2003 Configure Your Server Wizard, or by creating a customized automated installation of Windows Server 2003.

A virus is a malicious program. A computer virus passes from one computer to another in the same way as a biological virus passes from one person to another. Most viruses are written with a malicious intent, so that they can cause damage to programs and data in addition to spreading themselves. Viruses infect existing programs to alter the behavior of programs, actively destroy data, and perform actions on storage devices that render their stored data inaccessible.

Computer viruses attack the software of a computer such as operating systems, data files, application software, and e-mails. However, viruses do not affect the computer hardware.

The Group Policy Management Console (GPMC) is a tool for managing group policies in Windows Server 2003. It provides administrators a single consolidated environment for working on group policy-related tasks. GPMC provides a single interface with drag-and-drop functionality to allow an administrator to manage group policy settings across multiple sites, domains, or even forests. GPMC is used to back up, restore, import, and copy group policy objects. It also provides a reporting interface on how group policy objects (GPOs) have been deployed.

A spider is an automated program, such as a search engine, indexing program, or cataloging software. It requests Web pages much faster than human beings can. A spider is also known as crawler and robot.