In tip 3598 and links, I described how to disable the dynamic Domain Name System.

Microsoft Knowledge Base Article 294832 contains the following summary:

This article describes how to disable the dynamic Domain Name System (DNS) registration behavior of Windows 2000 client computers with a Windows 2000 Group Policy. Windows 2000 supports dynamic DNS updates (refer to Request for Comments \[RFC\] 2136). This behavior is enabled by default for Windows 2000 DNS clients.