I've heard people talking about replaing live trading sessions for practice. I am really interested in this. What software / data is required? Is there a way to do this for free or for a small-flat rate instead of monthly subscription? I already have a real-time data feed from DTN IQFeed, I'd rather not sign up for a monthly eSignal subscription. Being able to practice during off-hours / weekends would be really great. Thoughts?