Computers Near Me on some 2000 wkstns

We have 95, NT and 2000 workstations on a Novell Network. On some of the 2000 workstations there is not ‘Computers Near Me’ option under Network Connections. On some it does appear and we cannot find any visible differences in the configuration. These machines are unable to see the other NT and 2000 workstations. Any suggestions on why some of these machines do not have it?