[Samba] WINS servers and browsing

[Morgan Toal]

Well, I've asked a couple times already but I will ask one more, since I still havent' managed to get any further.

We have several sites. Each site has it's own network and domain. 
We are connected via a WAN.
Is the best practice to have one WINS server for each site?
Or is a single WINS server for the WAN the way to go?
Right now I have a single WINS server for the WAN. 

I CAN NOT browse between networks correctly.
How do I test WINS anyway?

Thanks,
mtoal

Here's some config info:

Network 192.168.18.0, CH domain
192.168.18.14 ch1 (rh7.3, CH domain controller, wins server)
192.168.18.15 ch2 (w2k, app server, set ch1 for wins manually)
192.168.18.18 mtoal (w2k, my computer, set ch1 for wins manually)

Network 192.168.20.0, PW domain
192.168.20.8 pw1 (rh7.3, samba, PW domain controller)
192.168.20.5 pw2 (w2k, app server, set ch1 for wins manually)
192.168.20.61 streetsmary (w2k, example machine, ch1 for wins via dhcp)

ch1 is set up as the WINS server for the whole WAN:
netbios name = ch1
workgroup = ch
os level = 64
preferred master = yes
domain master = yes
local master = yes wins support = yes
remote announce = 192.168.18.255 192.168.20.255
remote browse sync = 192.168.18.255 192.168.20.255
name resolve order = wins lmhosts

pw1 is set up to use ch1 as it's WINS server, and is
set up to be the local master browser on its subnet:
netbios name = pw1
workgroup = pw
domain master = no
local master = yes
preferred master = yes
os level = 64
wins support = no
wins server = 192.168.18.14
name resolve order = wins lmhosts