Ok, you are in the right place. The above is from:
http://www.root.cz/clanky/historie-vyvoje-textovych-editoru-krkolomna-cesta-k-modernim-textovym-procesorum/The subject line is in Czech and means: The history of development of
text editors: arduous path to a modern word processor. The piece is by
Pavel Tišnovský who works at Red Hat. The point is that this article
shows XyWrite 4 as some kind of apex of word processing. A good summary
of the early days of word processing as a whole. A lenghty list of links
at the end. This list alone is worth a look. No Czech required! Clearly
this guy is well read in his subject matter.