In a conference room at Sun in the 1980's, I saw a touch screen control panel on the speaker's podium for raising and lowering the lights, projector screen, con

In a conference room at Sun in the 1980's, I saw a touch screen control panel on the speaker's podium for raising and lowering the lights, projector screen, controlling the projector, etc. It has a small solenoid with a rubber mallet at the tip which would go "thunk" against the back of the glass to provide haptic feedback for the virtual buttons. Pretty low tech, cheap, simple but effective.