If I remember right, Apple Menu - Location - "Building 1" or "Building 2". Just make sure the settings are right for each in the control panal.

Oh wait, sorry, Windows 2000. Not sure offhand of any program that would do this. Though, with Win2k, you shouldn't have to reboot after changing the network. If it's asking, 2000 is damaged. If it's not asking and you are rebooting anyhow, just disable and reenable the network connection for the same effect, unless it's domain related as to why you are rebooting.