Yes, it was one of the Xanadu hackers who came up with that one (but it was never published and stayed internal to that group.) Post-Xanadu the idea migrated to

Yes, it was one of the Xanadu hackers who came up with that one (but it was never published and stayed internal to that group.) Post-Xanadu the idea migrated to Joule, Inc. then to Electric Communities, then MojoNation, and after that it just became the way things were done...