Returns the user data area associated with the current Gen message.
When a MsgFlow parameter of 0 is passed into the main entry point, USEREXIT(), this indicates that the user exit is being called just after the response message is received from the requesting client. The message size returned is that of the message just received from the client.
When a MsgFlow parameter of 1 is passed into the main entry point, this indicates that the user exit is being called just before sending the response message to the requesting client. The message size returned is that of the message about to be sent to the client.
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