- IIOP is the Internet version of GIOP.
- Messages are transmitted over TCP connections.
- Objects are located by a home port and host along with an object key.
- The home is not the only place the ORB can look.
- GIOP/IIOP PDUs are described in IDL.
- The OMG defines an encoding called CDR for the on-the-wire format.
- CDR is a straightforward and efficient binary encoding format.
- CDR may be big or little endian
- Values are not tagged (encoding is not self-describing).
- PDUs have serial numbers.
- Allows for multiple outstanding requests (no stop-and-wait).
- Originally requests go only in one direction.
- Recently the protocol has been modified to allow bi-directional operation
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