- Object and type descriptions
- The Interface Definition Language (IDL)
- Language mappings; how IDL is translated into target languages.
- Java, C++, C, Smalltalk, Cobol, Ada
- A common format for object communication (GIOP)
- IIOP is the way GIOP is expressed over Internet protocols.
- Several APIs required for object users and implementers.
- Object adapters (the POA)
- The ORB interfaces
- Many related interfaces.
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