In Windows 2000, the host name (Directory Naming Service (DNS)) and computer name (NetBIOS) must be the same.
In some previous operating systems, you could have two or more aliases that point to the same computer, by having multiple host names.
To view/change the computer name, use Start / Settings / Control Panel / System / Network Identification / Properties.
NOTE: In Windows 2000, the host name is the actual point of reference. The computer name was provided for backwards compatibility.