ClustersDefined (MQLONG)
This field specifies the number of clusters to which the channel belongs.
This field is the number of cluster names pointed to by ClusterPtr
.
It is zero or greater.
This field is relevant only for channels with a ChannelType
of MQCHT_CLUSSDR or MQCHT_CLUSRCVR.
This is an input field to the exit. The field is not present if Version
is less than MQCD_VERSION_5.