I would like to create a program that logs how much time is spent playing quake 1. I know the ip address and port of each computer on our network, what I need is to know is how can I tell if a computer is playing the game or not. What I would like is something like a ping command that the game responds to. I'm sure something like this exists because there are many web sites and programs dedicated to detecting quake servers.
Does anyone know if quake will respond to any command that I can detect?