In WPF you can ask the InputManager about that:

if (InputManager.Current.MostRecentInputDevice is KeyboardDevice)

In Noesis that information is not yet available, but it could be provided by the View, maybe something like this:

private void OnButtonClicked(object sender, RoutedEventArgs e)

{

if (View.MostRecentInput == InputType.Mouse) { ... }

else if (View.MostRecentInput == InputType.Keyboard) { ... }

}