May be of help?
Came accross Review of AVAST within PC Magazine URLS of
http://www.pcmag.com/article2/0,2817,2282704,00.asp
And also
http://www.pcmag.com/slideshow/0,1206,l=226370&s=1594&a=226369,00.asp
[You may have problems with the “slideshow” url, so you may have to copy and paste it into the address field of internet explorer?]
You can play the “Slides” by clicking on the first image and then use the "Next " key buton to view them one at a time
The slides shows/explains the Avast programming
Regards