Applications can open a queue using the MQOPEN call. Applications use the MQPUT call to put messages onto an open queue. Applications can put a single message onto a queue that is not already open, using the MQPUT1 call.
If you set up clusters that do not have multiple instances of the same queue, there are no specific application programming considerations. However, to benefit from the workload management aspects of clustering, you might need to modify your applications. If you set up a network in which there are multiple definitions of the same queue, review your applications for message affinities as described in Reviewing applications for message affinities.
Also, be aware of the following:
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