This data stream contains either a distributed data management (DDM) request from an application requester (AR) program, or a DDM response from an application server (AS) program, as that request or response exists before it is given to the lower level CN component for addition of headers and transmission across the wire.
Besides content, the main difference between the trace information for receiving data streams and sending data streams is that for the latter, the six-byte DSS header information is missing. For the first DSS in a send data stream trace area, the header is omitted entirely, and for subsequent ones, six bytes of zeros are present which will be overlaid by the header when it is constructed later by a CN component module.
The IDs of the Distributed Relational Database Architecture™ (DRDA®) function that is being performed are the same as those listed for RWff RC—Receive Data Stream Trace Point.