You can do it in hardware with 1 wireless mouse and 2 mouse receivers if you intentionally set them to the same frequency (hit the sync button on both receivers then hit the one on the mouse). This does not work with mice that don't need to be sync'd and the further you get away from the receivers, the more out of sync they will become. Keep them a few feet (1 - 2) apart and it should work fairly well. Move the cursor to a corner to resync.