Length of the message in BUFFER.
Zero is valid, and indicates that the message contains no application data. The upper limit for BUFLEN depends on various factors:
If one or both of the above conditions is not satisfied, BUFLEN cannot exceed the smaller of the queue's MaxMsgLength attribute and queue manager's MaxMsgLength attribute.
When a message is on a transmission queue, additional information resides with the message data, and this reduces the amount of application data that can be carried. In this situation it is recommended that LNMHD bytes be subtracted from the MaxMsgLength values of the transmission queues when determining the limit for BUFLEN.
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