Trader.NET 2005 supports simulated trading based on the real-time or recorded data from TWS. The built-in fill engine has advanced algorithm to decide how and when an order should be filled based on your order time and price priority, and current market depth. In addition, the fill engine simulates the network latency (200 ms one way) between your computer and broker order processing system. The fill engine evaluates the open orders tick-by-tick.