This topic has explanations of the different parts of the WebSphere MQ link solution that you'll need to understand to be able to program for interoperation, configure and administer it.
There are two logical parts to the WebSphere MQ link solution:
If you connect a messaging engine to a WebSphere MQ network using the WebSphere MQ link and you want the messaging engine to be highly available, there are some high availability considerations. See High availability of messaging engines that are connected to WebSphere MQ.