How do we get position of Copter from RealFlight 9.5

We want to get the position of Copter from Real Flight 9.5 instead of SITL. We have found RealFlight Link(formerly FlightAxis), but it doesn’t have document on how to use these SDK. In SIM_FlightAxis.cpp, it has to fetch data from Real Flight. How do we do to get data from RealFlight ?