GIOP: General Inter-ORB Protocol
The GIOP defines a set of message formats and data formatting rules to facilitate ORB - ORB communication.
The Common Data Representation (CDR), which is tailored to data types supported by IDL, handles inter-platform issues such as byte ordering and provides the standard for the machine-independent representation.
The GIOP specification defines a set of message formats that support all of the ORB request/reply semantics.
Also defines format for Interoperable Object References (IOR), created whenever an ORB passes an object reference across ORB’s.