Entire Network link for Network Neighborhood can be disabled. Perhaps for security reasons. Got some paraiahs? This Windows NT / Windows 2000 registry hack removes all computers outside of the workgroup or local domain from lists of network resources in Windows Explorer and My Network Places. Need to setup workstations for web browsing in public areas but want to disable Network Neighborhood access? Create separate domain for this purpose and set:

Hive: HKEY_CURRENT_USER
Key: Software\Microsoft\Windows\CurrentVersion\Policies\Network
Name: NoEntireNetwork
Type: REG_DWORD
Value: 1