1. Current page and total page numbers will show. Any well made ebook should have a Table of Contents that shows what page each chapter starts. Simple math will tell you how many pages before the chapter ends.
2. The PRS-600 does not have this feature but people who leave ebooks on their Reader typically leave the ebook on the last page. If you are reading multiple books the Reader will remember the last page read for each book.
3. If the Reader was registered with Sony then you can either de-register through the Sony software or in some situations may have to call Sony directly to de-register.
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