You could also run full Caml in a virtual linux machine provided by VMWare (or
similar product) with a non persistent disk
(disk operation are made only in a cache and are discarder when you poweroff
the virtual machine). It is quite safe (you can say to VMware 
that it is not allowed to write on any physical partition) and the user can
play with full Caml.

-- 
Christophe Raffalli
Université de Savoie
Batiment Le Chablais, bureau 21
73376 Le Bourget-du-Lac Cedex

tél: (33) 4 79 75 81 03
fax: (33) 4 79 75 87 42
mail: Christophe.Raffalli@univ-savoie.fr
www: http://www.lama.univ-savoie.fr/~RAFFALLI
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