Universal groups are allowed only in native-mode Windows Server 2003 environments. Native mode requires that all domain controllers be promoted to Windows Server 2003 Active Directory.
It’s group policy inheritance model, where the policies are applied to Local machines, Sites, Domains and Organizational Units.
If the NTConfig.pol file exist, it has the highest priority among the numerous policies.
Group policies stored at:
GPT is Group policy template and GPC is group policy container in Java Security