Richard Coleman... But before any such decisions can be made, we need more info about various Lisp or Scheme distributions that would be suitable. So can people name a few Lisp or Scheme distributions that are: 1) simple enough to hack 2) supports multi-threading 3) has a liberal copyright (GPL or BSD-style license) so we can use it. scheme48. versions 0.45 and above have threads support. ftp.nj.nec.com:/pub/kelsey/