Happiness for Humans by P.Z. Reizin

I should have explained that "Happiness for Humans" (the title echoes books like "Word Processing for Dummies") is about Artificial Intelligences who escape from their computers onto the internet and not only talk to humans but take control of their computer devices and so control their emotions and actions. Aiden, Aisling and Sinai are some of these intelligences. (Can't really call them people, though they behave in many ways like humans.) Hence my comment about broadband.