Cliquer un microdrive, choose folder QLDemo
Menu QL, QL configuration, Start-up, Autopress F1

This folder contains a QL demo program. It needs at least 384KB of RAM.
The program is actually a collection of four distinct graphics demos.
Try it also on a real QL to see the difference, or simulate a real QL
by unchecking the 'Use accelerated QDOS graphics routines' in the
'Graphics' page of the 'QL Configuration' dialog and by selecting
'Original QL' from the 'Speed' menu.