The Alto used a three-button mouse. It was Charles Irby and Dave Smith who decided it would be two for the Star. It was a bitter debate, but they won. When it

The Alto used a three-button mouse. It was Charles Irby and Dave Smith who decided it would be two for the Star. It was a bitter debate, but they won. When it was three, every Alto program had its own set of conventions for them. There was no way that could have been unified for a multi-purpose computer.