Sony wouldnt have included that.. Plus you'd need a transmitter from the laptop to the BR player, unless you're talking about some kind of remote viewing software, but that would be super laggy.
"wifi desktop" as you call it, without knowing the specs of the laptop, would most likely require you to buy a kit and spend a few hundred bucks to get one that didn't suck.. And depending on the unit you need killer wifi speeds.
He's better off hooking the laptop up to the tv using a cable, then adding a wireless keyboard and mouse... Check out Logitech brand. You can run a wireless keyboard and mouse of the same USB dongle so he doesn't take up all his ports. They even have wireless keyboards with backlit keys