Network List on Domain

I’m running my network on a domain using Server2003 as the domain controller. When I log on to the network with a client machine it can’t see a list of the computers that are connected to the domain. I can access the machines directly using the computer name or IP address. I also make use of a vpn, and when users are logged into the vpn however I can see them. Why cant I see the rest of the users that are logged on?

Thank you in advance

NetBEUI won't help, especially for VPN users since it's a nonroutable protocol. See your previous thread you opened for this same issue. It works a lot better if you don't create multiple threads for the same problem.