I don't know were I found this Back-Glass,but it has helped me many times in finding the Rom ID of some games. I added many new lamps as well as color coded the lamps. The original Back-Glass came from BlackSad or BlackSand not sure on the spelling, thanks BlackSad for allowing me to mod your Back-Glass. The best way to use it is to rename a copy of the table you are working on to the same as the Back-Glass, then run the pinball in question. you can then write down the numbers of the lamps. And input them into the back-glass or pinball you are working on.