The IIOP specification defines a set of data formatting rules, called CDR (Common Data Representation), which is tailored to the data types supported in the CORBA Interface Definition Language (IDL)
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Using the CDR data formatting rules, the IIOP specification also defines a set of message types that support all of the ORB semantics defined in the CORBA core specification
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The messaging formats and the CDR constitute the General Inter-ORB Protocol (GIOP).
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IIOP is the GIOP message format sent over the Transmission Control Protocol/ Internet Protocol (TCP/IP).
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Using IIOP any CORBA client can speak to any other CORBA Object.The architecture states that CORBA objects are location transparent.
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