wouldn't your laptop's screen need to be the exact same size/resolution? cause in one screen the mouse might be moving, but the other the mouse is already stuck at the side... i dono

you will run into problems where one char is lagging behind the other because there is a delay in what you see on one screen and what the other characters are actually doing

try installing keyclone on both computers? problably cheaper than buying 2 sets of wireless kb/m