Sutton Online has been a Virtual Transaction vendor for a while, but they finally released their product, GlobalDAT. I must say, it is a great piece of software. I don't want to sound like a seller, but they told me the system is on Sun systems, and run on Oracle. It is fast! Doesn't have all the features of Realtick(you may or may not use them), the charts are EXCELLENT, and you can trade on many markets (effective 5/1). I checked the background of this firm )NASDAQ:STTN, and they seem to be on the rise. Good luck!