To add comments to a PDF document:

1. Navigate to a PDF document.

2. Select the document, and then select File > Open (Read Only).

   The PDF opens in read-only mode in a separate window, with its comments.

   If you use Internet Explorer, then the browser also launches an extra blank page. To avoid this, select the Internet Explorer Tools > Internet Options menu option, then select the Advanced tab, and make sure the Reuse windows for launching shortcuts option is specified.

3. To add comments, use the Acrobat commands for doing so. For more information, see your Acrobat documentation.

4. To save your comments to the repository, click Adobe’s Send and Receive Comments button.

   Comments that are saved in a repository have the Acrobat .XFDF format.