“Support for Kindle Print Replica content, which look like the corresponding print book with words and images in the position corresponding to the print edition. See more detail on Print Replica contenthere.
Support for reading most PDF files within the Kindle application, including functionality such as zoom and pan, highlighting, note taking, dictionary lookup, and bookmarks.
By the way, I’ve read that it’s best, when finishing a book within the PC for Kindle app, to use the top menu’s File/Close process, which is said to not only log to your computer your latest activity on the book but will activate sync’g of your session’s work with Amazon servers.
It’s similar, in a way to reading on the Kindle, in that pressing the Home button, when you’re through reading, closes the book and — while doing so — logs, on your Kindle, your last-page read and any highlights and notes during the session that haven’t been saved.
In this case (on the Kindle itself), Amazon doesn’t see this latest info until you turn Wireless ‘On’ later and select the Sync and Check process (although sync’g will be done if your wireless is ‘On’ and Amazon servers happen to do a check of your Kindle during a connected session).