This article is from the Object-Oriented Technology FAQ, by Bob Hathaway firstname.lastname@example.org with numerous contributions by others.
See APPENDIX B.
A four week test-version of ConceptBase V3.1 is available
on the FTP server ftp.informatik.rwth-aachen.de in the
directory pub/CB. For running the ftp version you must ask for a
key by email.