Как узнать, на каком окне сторонней программы установлен фокус?

#include <WinAPIEx.au3>

HotKeySet('{ESC}', '_Quit')

While 1
	$t_Point = _WinAPI_GetMousePos()
	$hHandle = _WinAPI_WindowFromPoint($t_Point)
	$hWin = _WinAPI_GetAncestor($hHandle, $GA_ROOT)
	$sClassW = _WinAPI_GetClassName($hWin)
	$sFoc = ControlGetFocus($hWin)
	If $hHandle = $hWin Then
		$sMessage = 'Class Window: ' & $sClassW & @LF & 'Title Window: ' & WinGetTitle($hWin) & _
				@LF & 'Focus: ' & $sFoc
	Else
		$sClassC = _WinAPI_GetClassName($hHandle)
		$sID = _WinAPI_GetDlgCtrlID($hHandle)
		$sMessage = 'ID Control: ' & $sID & @LF & 'Class Control: ' & $sClassC & @LF & _
				'Class Window: ' & $sClassW & @LF & 'Title Window: ' & WinGetTitle($hWin) & _
				@LF & 'Focus: ' & $sFoc
	EndIf
	ToolTip($sMessage, 0, 0)
	Sleep(50)
WEnd

Func _Quit()
	Exit
EndFunc   ;==>_Quit