As Mirai mentioned Hotkeynet does not broadcast mouse movements. Instead it only does clicks. Basically, when you hit the hotkey to broad cast a click, it captures the location of your mouse as X-Y coordinates on your game window and sends a click at the same position of the window to the other clients. It does not infact record or send any of the mouse movements (as far as I'm aware of anyways). ISBoxer does do a broadcast all function, but for even without the addition of de-sync due to knockbacks, CC, etc, movement is not really feasible with it due to slight inaccuracies that will occur. Mirai also does a fantabulous job of demonstrating this in the first episode of his multiboxing basics video series.