It is still a dos based program, but to the best of my knowledge, it is one of the few backtesting platforms that allows for portfolio level testing as well as mult-systems testing. It is a powerful software, but like I said, I currently don't have the time to delve into trading or TR now...I'd prefer to just cut my losses now and hopefully someone else will purchase it from me at the discounted price and make better use of it. Please check out the TR website to learn more about it's functions and capabilities.