I'm not sure exactly where this would fit, but I assume this spot will do.
I heard awhile back that it is possible to "hack" a car using little more than a rooted cell phone or a computer. (i.e. Unlocking and locking doors, activating the horn, remote start if the vehicle has the option)
Does anyone know how valid an idea this may be, or where I could find some material on it? I've been searching for ways to do it but I can't for the life of me find a single piece of information on how this may be done. Honestly, I don't have much use for it, but it would be fun to show off given the opportunity (Using my own car or a friends with consent, of course)