For those wanting to see what's on the neighbours PC then you'll need to go to explorer and then Tools -> Map network drive -> network domain dialogue box should then show available networks, yours will be one of them and there's will be another one. It's highly likely that they have no idea how to even share drives so you'll only be able to see their shared documents I'm afraid If not then go for your life lol!

Of course this would be hacking and therefore illegal

Andy