Object request broker (ORB) services
  Implementation repository services 
  Installation and activation services 
  Interface repository services 
  Replication services 
Common object services
  Change management services 
  Collections services 
  Concurrency control services 
  Data interchange services 
  Event management services 
  Externalization services 
  Licensing services 
  Life cycle services 
  Naming services 
  Persistent object services 
  Properties services 
  Query services 
  Relationship services 
  Security services 
  Start-up services 
  Time services 
  Trading services 
  Transaction services