[NTG-context] mouseover and other advanced knowledge

Hi Hans, I'm trying to learn more about mouseover and other PDF related ConTeXt features. In an older email you recommended to look at your tug2001 demo (pre-2001.pdf). Is there also the .tex code to be read or is this your companies secret? If so, do you have some other examples to be read (as .tex files)? Thank you, Steffen