diff --git a/robotgo.go b/robotgo.go
index d11e4cb..b82bfb9 100644
--- a/robotgo.go
+++ b/robotgo.go
@@ -1457,9 +1457,15 @@ func FindIds(name string) ([]int32, error) {
 	return pids, err
 }
 
-// ActivePID active window by PID
-func ActivePID(pid int32) {
-	C.active_PID(C.uintptr(pid))
+// ActivePID active window by PID, 
+// If args[0] > 0 on the Windows platform via a window handle to active
+func ActivePID(pid int32, args ...int) {
+	var hwnd int
+	if len(args) > 0 {
+		hwnd = args[0]
+	}
+
+	C.active_PID(C.uintptr(pid), C.uintptr(hwnd))
 }
 
 // ActiveName active window by name
diff --git a/window/goWindow.h b/window/goWindow.h
index af2cc89..a704179 100644
--- a/window/goWindow.h
+++ b/window/goWindow.h
@@ -85,7 +85,7 @@ void set_active(const MData win){
 	}
 #endif
 
-void active_PID(uintptr pid){
+void active_PID(uintptr pid, uintptr isHwnd){
 	MData win;
 	#if defined(IS_MACOSX)
 		// Handle to a AXUIElementRef
@@ -94,7 +94,11 @@ void active_PID(uintptr pid){
 		win.XWin = (Window)pid;		// Handle to an X11 window
 	#elif defined(IS_WINDOWS)
 		// win.HWnd = (HWND)pid;		// Handle to a window HWND
-		win.HWnd = GetHwndByPId(pid);
+		if (isHwnd == 0) {
+			win.HWnd = GetHwndByPId(pid);
+		} else {
+			win.HWnd = (HWND)pid;
+		}
 	#endif
 
 	SetActive(win);