My avionics company is looking at developing an application to modify the FSX simulation parameters (altitude, position, etc.) so we can control the plane with our auto pilot. How hard is it to use the SDK to modify the values of these parameters and what languages are supported? We usually use C for development. Also, can you connect to flight sim from any external program and change variables or can you only do it with an "add-on"? Any help on these questions would be great! We have done some work with FSUIPC, but management wants an in-house solution.