Time-based annotations allow you to add markers with information at specific points throughout a presentation. You can add annotations to a presentation to refer to a specific point in the video, include additional information about presentation content, or refer to outside information.
Annotations can also contain discussions, which allow viewers to comment throughout the presentation.

Presentation with annotations added
   Channels have varying 
configurations so annotations may not be available on your system. Contact your 
Mediasite administrator for more information.