NT workstations do not share routing tables (nor do NT servers). Workstations receive routing information from manually configured gateways under TCP/IP properties, by receiving default gateway information from a DHCP server, or from ROUTE ADD statements from the command line (there are also default routes, like loopback). From a command prompt on a workstation, type in ROUTE PRINT and you will see the routing table.
If you are refering to browsing, that is a differnet story. A Browse Master is a computer that maintains a list of computers on the network (what you see in Network Neighborhood). To disable this feature on an NT workstation, navigate to:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Browser\Parameters
and make sure MaintainServerList is "NO" and make sure IsDomainMaster is "False".