Up until a little over 6 months ago, it was actually a very valid question to ask what Hotscripts ran on, it ran on a highly modified version of LinkSQL, written by Gosseimer Threads (sp?). Since September 1st, 2004 it has been running on a system designed from the ground up custom for Hotscripts, and you won't find anything like it anywhere on the Internet (I know as I wrote it).