I see Microsoft have put up a developer site on MSDN for their new ESP product. They provide an SDK which appears to track the FSX SDK. I haven't had time to look at it in detail to see if there are any insights that might help in FSX.http://msdn.microsoft.com/en-us/library/aa155301.aspxscott s..

Thank you, Scott, it seems that Phil Taylor has been very busy. The S.D.K. overview is particularly descriptive, a very good introduction to the various aspects of Flight Simulator. Perhaps many would benefit from reading it.Best regards.Luis