Interface Definition Language (IDL)
    Contains a syntactical description of the IDL 
    Contains description of the elementary interfaces
    Contains a variety of  Language Mappings

Object Request Broker (ORB) and the ORB-domain
    The entirety of all object implementation an its instances is called a domain
    Orb is the backbone for all communication
    The orb rules the Interaktion between distributed objects 
    It is not probable, that the ORB is one concrete object.
    ORB is more a distributed logic