I understood that Scalperten was using demo software, but I think Scalperten was asking about live trading. I apologize if my response was unclear about that. Thanks for clarifying it for everyone. Also, thanks for the pointer about LightSpeed's order routing, and thanks for sponsoring ET.
Looking back, I guess he was asking that. Some demo environments are better than others. None will allow you to interact with real order flow while outside real exchanges. It is just not worth the time and effort to do that. Many will just give you executions if you take offers and hit bids. LST uses last sale. We want to allow you to enter orders, work on the look and feel, view the order book, executed order, position management, charting, margin window etc. We have a high conversion rate of demo users to new accounts. Users seem to really enjoy the offering.