Market data is recorded from a real live exchange. The recording data can be played back in real time or delayed, in any manner, to simulate the recorded market. Moreover, one or more users can participate in the simulated market just as if they were participating in a real-live market. The system provides a realistic trading environment without the associated risks of trading in a live-market such as losing money and the cost of making trades. The system may be used for training purposes and for purposes of testing and analyzing various trading strategies. Software developers and testers may also utilize the realistic environment to develop trading products or applications. Additionally, the system provides a means for demonstrating trading application products.