I’m attracted by something about “realtime visual collaboration on the web”.
OpenStudio project launched in 1990 according to Whitney artport archive. Andy Deck has a website where he posts all his experimental works using fundamental functions of hypertext and pixelerate images from 1990 to the present. Here is another similar project by him launched in 2002 (Collabyrinth) in which users create their own desktop icons.
These two sites have similarities in terms of interactivity among the participants. Both have “record” “save” “open” functions that let one person saves and stores a piece and then others can share it overtime from the archive.