Hi Ryan,
XPression is unaware of any other machines on the network, so using transition logic with a separate engine is impossible.
You could however use RossTalk commands but then the operator would have to select the correct Scene to play (so a scene with a RossTalk command that triggers the other machine or a scene that doesn't need to trigger the other machine).
Another option could also be to use the API. Using the API you could monitor both engine and have the application perform the Transition Logic on both machines.
A third option might be to use Dashboard but I'm not proficient enough in Dashboard to know whether or not you can check which scenes are online on an engine to decide which transition to play.
Best regards,
Kenneth
#XPression