AutoCAD 2008 User's
Guide > Get
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Updates and Announcements >
Receive New Information Notifications
Whenever new information is available, Communication Center notifies you by displaying a balloon message below the Communication Center button on the toolbar.
Click the link in the balloon message to open the article or announcement. If you prefer not to be notified by Communication Center, you can turn off Balloon Notification in the InfoCenter Settings dialog box. You can also customize the transparency of balloon messages as well as the length of time they are displayed.