thanks a bunch for the earlier explanation - much appreciated. where does the risk control come in? I guess this is all on the tt front end - eg if a trader has size limited so he cant trade over x lots or can only trade on x product, cant trade if he losses x amount in a day etc. this is obviously a better architecture - im surprised everyone didnt/doesnt do it this way! dont tell me harris has a patent on an architecture as well! is that possible? ps - i see why you call your self market hacker now!! sweet.