[Extremo]

Here is a good indicator, how do you identify if a player is the same player? The player ID constantly changes, so how do you identify a SPECIFIC player to be the EXACT SAME player? If you know this, next question:

How do you identify a SPECIFIC vehicle? The vehicle ID constantly changes, so how do you identify a SPECIFIC vehicle constantly? Or rather, how COULD you?

Once you know these two, the magic is to somehow combine the two and you're settled.