Message Board : Software to track oppenents

In Ed’s article "Take a stand tilt": http://www.notedpokerauthority.com/no-limit-hold-em/on-take-a-stand-tilt.html 

I noticed you use some kind of poker tool to see what kind of action your opponent gives, the "21/14/1.8" is what im reffering to. Can you share what tool you use and what these stats mean? Ive been looking for something like this, but cant seem to find a good tool.

Thanks.

PokerTracker is a database software that takes online hand histories as inputs and then dissects that information in about a bazillion ways. The quoted stats are provided by PokerTracker. The new version includes a HUD that reads your PokerTracker database and allows you to superimpose whatever stats you want for each player on top of the table window while you play.