[Athen] screen magnification and Macs

[rmhaven at stanford.edu]

Hi, Robert!

One thing to add to the previous comments: Mac OS Zoom can provide an  
onscreen orientation showing what part of the screen is being  
magnified.  Under Zoom's "Options", select "Show preview rectangle  
when zoomed out".  Then with the max. and min. zooms set at, say, 3x  
and 1x, the student can toggle between "zoom in" and "zoom out" and  
see where they are in the "zoomed out" mode.

- Shelley Haven