In the world of textbooks, if a student were reading offline, and got to the end-of-section quiz, would his or her answers be cached as annotation, or by some other means? What becomes of the correct answers or the instructor's comments?
What if the subject material doesn't lend itself to serial reading? A 'last page read' marker isn't versatile enough for that case.
Back in the world of textbooks, it might be nice to have data that says "The instructor will skip this section" or "These sections should be skimmed before 4/15/10".
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