Been there
A very long time ago I contracted for IBM in Hursley and worked on a collaborative desktop product that was variously called SHARC or Lakes. IIRC it had address book, videoconferencing, chat, screen sharing, collaborative drawing. Clients for Windows and OS/2. All the kind of crap you'd see nowaways in the like of MS Team Chat or Zoom. Slight snag was it intended for ISDN lines on PCs that couldn't do realtime video without expensive ISDN video overlay cards (i.e. chain linking VGA cables in and out of the card) and therefore went pretty much nowhere.
I was mostly involved with the screen sharing software so I don't know how they tested the collaborative drawing app, but I bet dicks featured extensively.
Biting the hand that feeds IT
