this is just a minor one (does not affect functionality), reporting anyways…
when hovering over the leftmost output pin of Mouse (System Global) the pin info states “Keyboard State”.
looking inside the module it appears that the IObox does a conversion from “MouseState” (1) to “KeyboardState” (2)
https://vvvv.org/sites/default/files/imagecache/large/images/mouse_keyboard_state.PNG