>Assuming you got the window handle :
>

>declare integer GetWindowThreadProcessId in win32API ;
>integer hWnd, integer @lpdwProcessId
>lpdwProcessId=0
>lnThreadID=GetWindowThreadProcessId(nHWND, @lpdwProcessId)
>

Cetin

If you're just trying to get the thread ID, you can use _vfp.threadID.