"You can also now do crazy stuff like having multiple mice with multiple cursors, and linking keyboards, mice, drawing tablets, and touchscreens to each other arbitrarily. You can now have your dvorak keyboard for normal use and a second qwerty keyboard for when your coworker comes over for a pair programming session. You can even give your coworker the ability to focus and type into separate windows from what you’re working on."
Fragments of a Hologram Rose (1977) also by Gibson already had this.
Does anybody know even earlier instances?