Why are you asking a game-specific (Starseige Tribes) question in here?
But I'm a Tribes player so here:
Running a Tribes dedicated server should be the same in Win2000 as in Win9x/NT.
At the command line, go to the Tribes directory, and type:
infiniteSpawn *tribes +exec serverConfig -dedicated
Alternatively, you can create a shortcut that runs this command line.
Make sure that you've configured the serverConfig.cs file.
You can get more info on Tribes at: www.tribesplayers.com or www.planetstarseige.com
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Cheers,
kenshin