When I create a pdf, I often add blank pages at the end of each chapter, or the end of the document, to scribble my notes on. Its not ideal, but its quicker and easier than going in and out of 2 files (one for reading, one for writing).
While you can call up the keyboard in pdfs, you can't use it to type into pdfs with the iLiad's default software. I don't know if that's possible with 3rd party software.
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