SAT-TCL is a class library for Think Class Library (Think Pascal version) written by Patrick Hew, for using SAT through TCL. Since I (Ingemar) did not make SAT-TCL, please note that I can't answer questions regarding it. Questions as well as praise concerning SAT-TCL should go to Patrick. All I've done is to verify that it works - and it does. /Ingemar Patrick wrote: --- Hi Ingemar, I've just sent you a THINK Pascal Project which uses SAT with TCL. There are two dedicated classes for bridging the two, and the rest of the files are a demo based on your Tutorial. I'm sending it to you in case you want to have a look, or pass it onto others for comment. There may still be things to do, but I think that we'll only find out as products are developed. I was hoping that you would see fit to distribute it along with the rest of SAT, under the same conditions of use. Thanks, Patrick Patrick Hew phew@tartarus.uwa.edu.au