Why can’t I see all computers on Network

I have 15 computers running on a Novell Netware Network (4.1 I think). All the computers are set up the same as far as gateways, primary network logons and File and Print Sharing, etc. There are 3 computers that I cannot see in my network neighborhood. I am using the Client “Client for Netware Networks”, however if I use “Client for Microsoft Networks” I can still see the users in the network neighborhood. There is nothing unusual in the network setup that I can see that would make these 3 computers look any different from the rest. Any ideas? All computers are running W98. TCP/IP protocol…