Thanks to Tony C. who sent this suggestion as follow-up to the recent Social Media post:
[Disclosure: I haven't read the book and so this is not an endorsement.]
This book deals with “Human Multitasking” – not operating systems. There is a common theme to the discussions of this book and to other content about human-multitasking. Your “cognitive attention” can be directed to any particular task but sharing attention across multiple tasks will reduce performance.