How do the wireless flashes work?

Many photographers do not really know how the flashes they use everyday work. There is nothing strange as per the joke which says that only two people do know it: the guy who invented the wireless flashes and Phil Brandon from the Minolta company. Generally speaking flashes give you the possibility to be a god of light (maybe a bit exaggerated sentence but there is some of truth in it). Want to be the third person who know the inside of the wireless machine? Take a look at this. And make fun with your flash!!!