Dear User of Geometry Center Software: We would like to find out how you are using our software. Think of Geometry Center software as a new kind of shareware: you share your science and successes with us, and we share our software and support with you. The Geometry Center is funded by the National Science Foundation, and it is important that we be able to report to NSF the ways in which our software is being used. If you use Geometry Center software, please send us a letter telling us what you are doing with it. We need to know: (1) What you are working on - an abstract of your work would be fine. (2) What Geometry Center software you use. (3) How that software has helped you, for example, by increasing your productivity or allowing you to do things you could not do before. In particular, if you feel that Geometry Center software has had a direct bearing on your work, please tell us about this. We encourage you to cite the use of any Geometry Center software you have used in your publications. Please send the letter either via email to register@geom.umn.edu qhull@geom.umn.edu or via regular mail to Software Development Group Geometry Center 1300 South Second Street, Suite 500 Minneapolis, MN 55454 USA Thank you!