What if I'm writing a paper on the books of Bill Bryson, I want to have In a Sunburned Country open on my MacBook, and I want to have Notes from a Small Island

What if I'm writing a paper on the books of Bill Bryson, I want to have In a Sunburned Country open on my MacBook, and I want to have Notes from a Small Island open on my iPhone (at the same time)? There are legitimate reasons to have two devices logged into Google ebooks with the same account at the same time. Video games are different. Few people play two video games at the same time.