I know this has been covered relatively recently, but my wife has just installed a personal firewall on her machine and keeps getting a "So-and-so is trying to ping your computer" warning (same id every time).
Now if she hadn't got this firewall we would have been happily oblivious, so my first guess is that this is probably innocuous.
But can someone please tell me what it means
and also how dangerous can someone pinging the computer be?!