How to keep birds from running into your glass windows or doors

Here is an interesting product I ran upon that keeps birds from
running into large glass doors or windows.
My folks have a place in the mountains with lots of glass that birds
run into very often. They have tried placing decals on the glass with
mixed results. I sent them info on this product and they are going to
try it out.
Birds see UV light that we do not see. The decals reflect the sun's
UV light so that the birds see the glass and avoid it.
http://www.windowalert.com/windowalert.html