Windows Internet Name Service
While Windows 2000 uses Domain Name System (DNS) as its primary method for matching a host name to its IP address, Windows 2000 also supports Windows Internet Name Service (WINS) for the same purpose. WINS is the name resolution system used for Windows NT Server 4.0 and earlier operating systems.
Windows 2000 DNS uses hierarchical fully qualified domain names (FQDNs) rather than the flat NetBIOS naming conventions supported by WINS. However, WINS provides an important service for network administrators with heterogeneous systems supporting clients running older operating systems, such as Windows 95 and Windows NT 4.0. These older systems do support DNS name resolution but do not support dynamic updates to DNS records.