A 1988 demonstration of the Cognoter collaborative brainstorming tool in Interlisp.
https://www.youtube.com/watch?v=KzBj13OSVzM
It was an application of project Colab at Xerox PARC to study how computers could support face-to-face-meetings. The researchers designed a conference room with specialized equipment such as a touch sensitive projection screen and collaboration software in Interlisp running on networked workstations.
About Colab: