Release 10.1A: OpenEdge Development:
ADM Reference

CurrentMessage

Property that stores the handle of the current message being produced. This property is set when the message is created by the producer's sendMessage, it should not be set in any other way. The handle of the message is sent to the send handler, therefore in most circumstances, it should not be necessary to get this handle for use in application code.

Data type: HANDLE

Notes: Read and Write