The track command allows you to examine the ground for tracks. This process
takes action time. Your success is based on your intelligence. If you are
successful you will be given the direction through which the last person in
the room exited. This is useful if you want to 'off' player 'x' because 
they're a bloody so-and-so. Say they steal something from you and leave. Use 
the track command to hunt them down and terminate them!

Naturally, "water" rooms (rooms where you are considered to either be 
swimming or in a boat) cannot have tracks.
