[NTG-context] javascript tool for presentations

Dear all, this website http://www.icsr.agh.edu.pl/~polak/latex.html.var was mentioned in comp.text.tex. It allows dual-screen presentations in LaTeX: if your computer allows extended desktop mode, you can view your notes on your laptop screen and show your slides via the projector. Sounds like a useful tool - would something similar be possible for ConTeXt as well? All best Thomas