How to map drives across a WAN?

We have two IP subnets routed through a 3com 227 by IP. One is 10.0.16.x and the other is 10.0.18.x
The 10.0.18.x side has only Win98 clients; the other side has an NT PDC, and 25 Win95/98 clients.
I can make a telnet connection across the WAN, but cannot see the Win98 clients in Network Neighborhood.
I’m guessing that I need to make changes on the TCP/IP properties on the client side.
Can someone help out?
I’d like to be able to ‘see’ the opposite side of the WAN from either side.
Ted