Hello Valerie,
my presentation is very visual.  May I prepare in advance a movie of screencaptures of manipulations on my desktop.  It would be in Windows wmv file.  If so, does someone know a safe software to do such movie.  I found one, but I hesitate to install free unknown software:
http://www.clubic.com/telecharger-fiche314584-free-screen-to-video.html  (warning: I did NOT try it!!! one user had problems (computer died for unknown reason, others were fine)
A dynamic  powerpoint also would be easy. 
André Lemyre


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