PNP is available on-line at

http://www.pnponline.org/

It is a user friendly version of Uwe Hollerbach's one dimensional PNP program
and was kindly written by Brice Burgess.

Please let us (Bob Eisenberg: beisenbe@rush.edu  Brice Burgess:  nesta@iceburg.net)
of any criticisms or suggestions you would like to make.