Adding on to justACS' post... you could, in theory, completely divorce the caller from its nested. I don't want you thinking for some reason it must be impossible to do. You can do it. It just takes effort, and I've never seen a use case for that kind of separation. It would be equivalent of saying, "I'm hiring someone to do a job for me. I don't know what the job is and yet, somehow, when they give me the results, they'll give me results that are somehow meaningful to me." Or, another version: Pick a phone number at random, dial it, then say, "I don't know who you are, and I know nothing about you except that you have a phone number, but I'll pay you $100 to fill in this Mad Libs for me." Kind of odd. 🙂
