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SimConnect is a synonym for a protocol Microsoft published together with the FSX Acceleration Pack/SP2. All simulations that are based on FSX (this includes Prepare3D and MS Flight Simulator 2020) support this protocol. For a complete description of SimConnect and its feature please see Microsoft's ESP Documentation.
Yes, after a few months we finally found the answer. Sadly, Mike is on vacations right now so I'm afraid we are not able to provide the answer at this point.