Windows boxes on a routed network

I have a network with 3 sites. The primary site has a Cisco 2600 series with 2-WAN ports. Each port is connected to a seperate remote site via dedicated ESF T1 lines. The remoted sites also have 2600’s.

What is necessary to have the nodes on the remote workstations show up in Network Neighborhood, and vice versa? I have IP Directed-Broadcast enabled on all ports of all routers. But when at the remotes sites, I can’t see the NT or Win2K servers at the main site. One of which has a printer that I need to connect to.

Brian