The other day I learned some new commands from some person I meet during project I was working on, the commands were "LAYISO" and "BURST", so when I tried to use these commands on my computer (autoCAD 2002), it said it was a unknown command, so I started looking into it and saw something about being part of express tools, which I have no idea what it is. So where may I obtain it and how does it work, please help Thank You