Could someone help me out?

Dead frontier is a browser based MMO where you kill zombies and stuff. I realize that you cannot hack money/stats in this game but there are other ways to cheat on it. I was wondering if anyone could explain to me how you could view the source code of the game to determine if there are items on a given screen or not. This is possible as some have admitted to doing it but will not release how. Could anyone provide info?