When using flash-knoppix to install knoppix on USB, first it asks whether you would like to create an overlay file and then, afterwards, it asks if you want to remaster knoppix.

What is the difference between the overlay and the remaster thing?

I always considered the overlay as a "simple" (but not actual) remaster.

What does knoppix do on the USB if you answer Yes to the remaster question please?

Thanks in advance.