The WebSphere® MQ family forms part of the WebSphere Business Integration portfolio of products. Designed to help an enterprise accelerate the transformation into an on-demand business, this portfolio delivers five key capabilities that include: Integrate, Connect, Model, Monitor and Manage.
The MQSeries® for iSeries™ licensed program provides application programming services that enable you to code indirect program-to-program communications that use message queues. This allows programs to communicate with each other independently of their platforms, for example, between OS/390® and OS/400®.
For more information, go to the WebSphere MQ home page 
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For documentation, go to the WebSphere MQ library .