This may be a more canonical site (Denning occasionally teaches at George Mason):
Noteworthy is the anthropomorphism in a 2002 assignment for a course exactly on the subject:
(2) Give an example of an action loop that occurred in your life recently. How many action loops do you participate in every day?
(3) In ordinary discourse we say that one person made a request of another. In computer discourse we also say that one server made a request of another server. What distinguishes the human request from the computer request?