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PDF has forms that you can fill out, yes. But technically speaking, ePub and Mobi should be able to use such features (it's HTML basically) and affect the content of the book. But I don't think it's implemented just yet...
Would be cool, tho. Sort of "smart" books that can tell what you're into, children's books that let you name that character(s) any way you'd like, change the order of events based on answers, ask you a few questions about a subject (if it's a textbook) and if you answer incorrectly it just points you to further notes, etc.
But right now they've got bigger issues, haven't you heard? Like audio and video. In books. So, yeah...
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