Adobe ACROBAT READER 7.0 Manual page 119

Sending and receiving comments in a browser-based
review
When you add comments in a browser-based review, they remain on your computer until
you send them by using the Send And Receive button on the Commenting toolbar. (This
button glows when you have unsent comments.) Until you send and receive comments,
you may not be able to see other reviewers' most recent comments, and they aren't able to
see your comments. To send and receive comments, the document must be open within a
web browser. When you send comments, they upload to the comments repository set up
by the review initiator.
If, after sending comments, you decide that a comment no longer applies. When you click
Send And Receive Comments after deleting comments, your comments are deleted from
the comments repository. However, you cannot delete or change other reviewers'
comments. Any comments added to the PDF document before it was uploaded to the
server are embedded and cannot be deleted online.
Note: Comments automatically upload to the server if you close the browser window or
navigate to a different web page.
To send and receive comments:
1. Do one of the following:
Open the PDF document in your web browser.
If you are reviewing the document offline, choose Go Back Online.
2. Do one of the following on the Commenting toolbar.:
Click the Send And Receive Comments button
Choose the Send Comments option
Your comments are added to the file on the server.
Choose the Receive Comments option
.
from the Send And Receive Comments menu.
from the Send And Receive Comments menu.