This is a utility that I use. I got it some time ago from the web connection message board, I think Rick Strahl posted it if I remember correctly. I don't know if this is exactly what you are looking for, but maybe it will point you in the right direction.

You can use WMI to do this:

FUNCTION KillProcess(lcExe,lcMachine)

lcMoniker = "winmgmts://" + IIF(!EMPTY(lcMachine),lcMachine + "/","")
oWMI = GETOBJECT(lcMoniker)
loProcesses = oWMI.InstancesOf("Win32_Process")
lcExe = LOWER(lcEXE)

FOR EACH loProcess in loProcesses
IF LOWER(loProcess.Name) = lcExe
IF loProcess.Terminate() = 0
RETURN .T.
ENDIF
ENDIF
ENDFOR

RETURN .F.