I don't have a write-up on hand but you can get a gist of these systems by looking at the product page of one of the major providers: https://www.wwwscn.com/pag

I don't have a write-up on hand but you can get a gist of these systems by looking at the product page of one of the major providers: https://www.wwwscn.com/page/show/service.html https://www.wwwscn.com/page/show/service.html What isn't shown is that they also inject ads into web traffic and (allegedly) can be controlled like a botnet.