On paper it's hard to keep on top of a document review cycle. Electronic document review lets you get all comments together in the one place and group them the way that works best for you. Using the Comments panel lets you keep track of comments added to your PDF documents. The panel displays a list of each comment, its type, reviewer name, time stamp, the contents of any pop-up notes and text boxes, and any replies.
toolbar button, then the Comments panel 
button. button.
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