Network Neighborhood

I would like some more information on the browsing service on an Windows NT domain. I am running most ethernet however, I do have some token-ring. It seems that the usres who are on token ring are not able to see the entire network (via network neighborhood); however, they can map to all network drives and access all network resources based on their premissions. Does anyone have any idea why this maybe happing and am I correct blaming it on token ring?