CORBA stands for Common Object Request Broker Architecture, a specification developed by the Object Management Group. This specification provides the standard interface definition between objects in different programs, even if these programs are written in different programming languages and are on different platforms. In CORBA, ORB acts as a "broker" between a client request for an object from a distributed object and the completion of that request.
A boxcar message is a type of message that contains more than one business document.