Does anyone know a lot about this stuff?

I was trying to read into it and it seems pretty good. I dont really understand how it would work with my 4 accounts on one PC. After having issues with my accounts I would be interested in additional measures if they are actually effective. I guess blizzard is sold out atm so a lot of people like these.

Its also not totally clear to me about how it stops key loggers.


Blizzard didnt have a very good description of it on their website.