The Windows 2000 Authorization Manager Runtime is a Windows 2000 Server version of the Windows Server 2003 Authorization Manager Role-Based Access Control (RBAC) API. Windows Server 2003 family operating systems introduced the Authorization Manager RBAC framework which includes the Authorization Manager API and Role-based MMC snap-in Administration UI (Authorization Manager Snap-in UI is only available on Windows Server 2003 family operating systems and on the Windows Server 2003 Administration Pack for Windows XP.) The Authorization Manager API provides a simplified development model in which to manage flexible groups and business rules and store authorization policies.