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Q: masked windows and reaction times

About views: the Macintosh drawing model is that applications keep their data
private and draw or redraw when requested by an update event. You cannot depend
on the screen to store what you draw, since it may be hidden or offscreen (and
thus never drawn). Consider also that you may have two screens of different
depths with your window in the middle. What would be stored where and how?

About reaction times: The keyboard and mouse are polled every 60th of a second,
so unless you build special hardware card for your experiments or generate a
lot of garbage, MCL should be fast enough. Don't except 1/1000s resolution
without a special input device anyway (you might be able to do it with the
modem port).