@gparker @halcyon @root42 you probably already know this, but speaking of source code, System 7.1 leaked a while back: https://github.com/elliotnunn/supermario/tree/9dd3c4bef84df2ea30f5ec2c5e97b043e8267b3f Might be useful as far as seeing how the underlying Toolbox stuff actually worked. They did a thorough job of commenting it.