I don't know -- I had a LabVIEW RT routine that had four Network Streams -- two were Message Handlers connecting a Host QMH with a Remote QMH (so they could exchange Messages, like the Host telling the Remote to start a stimulus Sequence) and two "data" Network Streams, one for DAQmx continuous A/D from Remote->Host (started and stopped by Host->Remote Messages) and the other "Event" data from Remote->Host, which included such things as "Button Presses" and changes to DIO registers (Events consisted of Identifiers, enums, and a millisecond Time Stamp, basically the "real" time since the Remote routine started running). Worked like a charm. Was developed originally in LabVIEW 2010, finished in LV 2012. I also tried to send some low-priority "occasional" information from Remote to Host via some Network Shared Variables, quickly gave it up as quirky and unreliable.
Bob Schor