List network devices (NT workstations, etc)

How can I list all the NT workstations on a network. I need it to work similar to NT's Server Manager or Windows 98 Network Neighborhood. Is there a way to poll a PDC or BDC for this list? Also, is it possible to generate a list of users that are logged on to the server? I don't want to install this app. on the server I would like it to run on a users workstation and perform these actions via the network.

Any ideas/pointers?

Here is some code. It uses ADSI. Just place your domain name where it says domain name

List users in domain. Just an addition. If you also want to know the accounts on the specified machine let me know.