This is a short video record of a mathematical seminar using E-Chalk, both at FU Berlin and at Brown University, USA.
The partners are connected via video conference. The actively lecturing partner - here locally in Berlin - uses the E-chalk software on a commercial rear projector. The echalk signal is transmitted in real time to the remote partner, who watches the lecturer via video conference and the E-Chalk board activity via http.
download video (WMV)