Connection-specific DNS suffix
Specifies a connection-specific DNS suffix. This policy setting supersedes local connection-specific DNS suffixes, and those configured using DHCP.
To use this policy setting, click Enabled, and then enter a string value representing the DNS suffix.
If you enable this policy setting, the DNS suffix that you enter will be applied to all network connections used by computers that receive this policy setting.
If you disable this policy setting, or if you do not configure this policy setting, computers will use the local or DHCP supplied connection specific DNS suffix, if configured.
Windows XP Professional only
Not Configured - No registry values are specified.
Disabled - Any values that would be created by the policy in the registry are deleted.
Enabled - Adding, modifying or delete values in the registry.
User Interface can be found in the Group Policy.
Please navigate to Computer Configuration - Policies - Administrative Templates - Network - DNS Client folder.