In Microsoft Windows NT and Windows 2000, a type of user account that is created during installation. All computers running Windows NT or Windows 2000 have two built-in user accounts:
Depending on whether the computer is a domain controller, a member server, or a workstation, built-in accounts will be either local user accounts or global user accounts. A built-in account on a domain controller is a global user account that exists everywhere within the domain.
Users can log on to any machine in the domain using such an account, which provides administrators with the capability of administering a Windows NT–based or Windows 2000–based network from anywhere on the network.
On a member server or workstation, the Administrator and Guest accounts are local user accounts and exist only on those machines.
Rename the Administrator built-in user account to make it more secure.