// Top-level message handling from FSX
 protected override void DefWndProc(ref Message m)
 {
     if (m.Msg == WM_USER_SIMCONNECT)
     {
         if (client != null)
         {
             client.receiveMessage();
         }
     }
     else
     {
         base.DefWndProc(ref m);
     }
 }