Anthony,
The Broker has a JMS API that allows JMS applications to use the webMethods Broker as a JMS Provider. You can install this API and its documentation and samples using the webMethods Installer. There is also a new WmJMSAdmin package for Integration Server that makes it easier to create JMS Topics and Queues on the Broker.
You do not need the Integration Server’s JMS adapter for java-based JMS applications to produce or consume JMS messages.
If you want to use Integration Server flow services to produce or consume JMS messages, you need the Integration Server JMS Adapter. This 6.x adapter allows you to create adapter services in Developer using a variety of adapter service templates. This adapter will use either the Broker JMS API or another JMS provider. The list of supported JMS providers is contained in the webMethods JMS Adapter Installation Guide.
I do not think it would be necessary to use MQSeries as a JMS Provider in addition to the webMethods Broker (with the JMS API).
Mark
#Integration-Server-and-ESB#webMethods