>While there are API functions that obtain the process id from a window handle or thread id the reverse is not true, and finding windows or threads for a given process id involves some sort of enumeration (for example EnumWindows()). This is easy enough in C++ or Delphi but not in Fox.

Thanks for you help. See my last reply to Nick for my solution. I'll keep what you mentioned above in the notes of my '.prg' That will help explain why I chose my final solution.

Mike