QUESTION Problem with code

Hey guys!
I just learned from the orginal post of the beggining with ac phyton im trying to make an easy info app, shows all info like RPM,car driver name and more. But a thing that confuses my is the l_lapcount, what is that, im trying to make that in the window appear the car name, and i'm confused with the l-lapcount and how i can make that ac recognises the car and names it in the app, help pls.

 

Code:

import ac, acsys

def acUpdate(deltaT):
        currentCar = ac.getFocusedCar()
        currentLap = ac.getCarState(currentCar, acsys.CS.LapCount)