Unmanaged hosts are hosts that do not have an agent. If you do not have an agent on a host, you cannot monitor your Primavera applications on that host. Therefore, to enable Oracle Enterprise Manager to monitor your Primavera applications, you must first convert unmanaged hosts to managed hosts by installing a management agent (agent) and then adding that host as a target in Enterprise Manager. Targets are entities such as host machines, databases, and Fusion Middleware components that can be managed and monitored in Cloud Control. Managed targets are entities that are actively being monitored and managed by Oracle Enterprise Manager.
For more information about adding agents to unmanaged hosts and creating targets, refer to the Enterprise Manager Cloud Control Administrator's Guide at http://docs.oracle.com/cd/E63000_01/EMADM/toc.htm.