Always interesting to see some hypertext history. I have a personal connection to KMS, so it was interesting to see that although it wasn't mentioned in the article, it was included in the references - just like in the original WWW proposal. ( https://www.w3.org/History/1989/proposal.html , although maybe the reference was lost in the HTMLization )

KMS was a a multiuser networked read/write hypertext system, a commercial spinoff of a CMU project from the 70's called ZOG.