My understanding is that the Nikon and i'd imagine the Canon flashes have a proprietry communication method, the Nikon one is called CLS (Creative Lighting System), I have NFI what the Canon equivalent is.
But if you use the yum cha branded ones from Protog, with wireless triggers you should be able to do everything the Nikon/Canon brand system would do for a fraction of the price.
But my knowledge of this is still pretty limited, I'm a noob so could be way off, but so far, I haven't discovered any drawbacks from the yum cha setup i'm running.