The information page on VMSpc is
here. I purchased the unit
here.
I recommend it anyone that doesn't have Detroit Diesel's
EDM/AIM or Silverleaf already. You can download the software free. The cost is in the controller box that connects your PC (serial port, requires a serial to USB adapter if your PC doesn't have a serial port) to the coaches engine diagnostic port.
Note: Click on 'here', 'here' or 'EDM/AIM' which are hyperlinks.