The IIOP Listener/Handler communication architecture involves the following software processes:

CORBA client

A client process that runs on a machine on which the Oracle Tuxedo CORBA C++ client ORB software is installed.

IIOP Listener (ISL)

An Oracle Tuxedo listening process, running on an Oracle Tuxedo server machine, that accepts connection requests from CORBA clients and assigns connections to an IIOP Handler also running on the server machine. It balances client connections across handlers. In addition, an IIOP Listener manages the pool of IIOP Handler processes, starting them in response to load demands.

IIOP Handler (ISH)

An Oracle Tuxedo gateway process, running on the Oracle Tuxedo server machine, that handles IIOP communications between CORBA clients and the Oracle Tuxedo server application. An ISH process resides within the administrative domain of the application and is registered in the local Oracle Tuxedo bulletin board as a client.

Each ISH process can manage multiple CORBA clients. An ISH multiplexes all requests and replies with a particular CORBA client over a single connection.