This operation returns the data structure for each OS known to the top-level OS to which the operation is directed. The data structure corresponding to the top-level OS is also returned.
This operation can only be directed to a top-level OS and not to a subordinate OS.

Operation Exceptions: 
1. INTERNAL_ERROR - Raised in case of non-specific OS internal failure. 
2. NOT_IMPLEMENTED - Raised when the OS does not support this operation.
3. COMM_FAILURE - Raised when communication to an entity (needed to help fulfill the request) is lost.
