Indicates the type of message being Put to the defined Request queue. The value is placed in the MQMD Message Descriptor structure field MsgType on the MQPUT1 call.
The message is one that requires a reply. The name of the queue and the name of the queue manager to which the reply should be sent must be specified in the ReplyToQ and the ReplyToQMgr fields respectively.
The message is the reply to an earlier request message (MQMT_REQUEST). The message should be sent to the queue indicated by the ReplyToQ field and the queue manager indicated by the ReplyToQMgr of the request message.
The message is one that does not require a reply.
A value of 2 (REPLY) or 8 (Datagram), will not generate a Get program or the service flow code to invoke a Get program. A value of 2 (REPLY), indicates that the reply would be targeted to the application that issued the request.
See MQMD Message Descriptor in the WebSphere MQ Application Programming Reference.