Referece in a function perimeter understanding

[zone19871]

void ChargeTrack(tracks track[],GWindow &Gwin)
ChargeTrack(&track[0],Gwin);

tracks is a struct and track is a array in the main block of code

I have code and i want to understand it.This code works so to make it short i will just post the essentials. I can someone describe to me how this works.