What is an integration broker?

What is an integration broker? What is the difference between an integration broker and message broker? An integration broker is a product acting as a "bridge" between two or more different third-party systems. Example being MQI (IBM MQSeries Integrator), or the products offered by WebMethods, SpiritSoft, and other EAI vendors. An integration broker *can* contain a message broker, as it is the case with MQI. But that's not a need-to-be. An integrator broker focusses on providing adaptors able to convert data to and from various third-party formats. A message broker, on the other side, focusses on transporting messages from one end to another.