Help. I can't get zoom window to follow text on g400 dualhead

Hi,
I'm setting up a computer for a visually impaired friend using my old
Matrox g400 pro dualhead. I have a zoom window on the second display
following the mouse cursor. In my computer I could check a box
labeled something like "zoom window follows text cursor". Now I can't
find that one. I have the zoom window following the mouse cursor
fine, but on my computer it used to follow the text whenever I was
typing. I've downloaded drivers all the way back to 2001 as well as
the latest ones and none have that feature that I can find. I no
longer have the drivers I was using, or if I do, I've forgotten how to
enable that feature.
I don't think I was using third party drivers, and haven't found any
to try.
If anyone can help it would be GREATLY apreciated.
Thanks,
Bob