WLS Node Manager, Domain, Admin Server once again

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  Oracle Node Manager is used to start, stop, and monitor Oracle WebLogic Managed Servers including the Administration Server. It periodically polls the WebLogic Managed Servers to ensure that they are functioning. If they are not functioning, the Oracle Node Manager takes appropriate action to restart the failed component to ensure that service is maintained.
  
  The Oracle WebLogic Administration Server contains both the WebLogic Administration Console and the Oracle Fusion Middleware Enterprise Manager. It is active only once within a WebLogic domain. If the server hosting the Administration Server fails, it must be manually restarted elsewhere.
  

Oracle WebLogic Managed Servers are the Java EE runtime containers for Oracle Portal, Forms, Reports and Discoverer Applications.