Roughly 20 years ago we embedded Java applets inside a HTML-based online help. This turned the help from a reading resource (which tells you where to find certa

Roughly 20 years ago we embedded Java applets inside a HTML-based online help. This turned the help from a reading resource (which tells you where to find certain preferences) into an actually interactive resource, composed from the same applets that also formed the Application itself. Worked like a charm. I have yet to see anything similar to that.