I think he's trying to log into 8 accounts at once in the same world by clicking play now on every one of them. No clue why you would wanna do this but it should work if the coordinates are correct.
note, you MUST move the mouse before you click the mouse, otherwise it'll just click where the mouse is (as in, clickmouse does not move the mouse - I have no idea what it asks for coordinates).
also note, that if that isn't fast enough, then you either need to get your buttons closer, or nothing will be.