LON-CAPA HelpOnly Course Coordinators and/or Instructors can send Critical Messages.
To send a Critical Message, do the following:
Send and display messages on the Main Menu.
New Message,
New Broadcast Message, and
New Messages from File), there is a
checkbox Send as critical message which sends this message as a critical message. Selecting Yes in reply to "Require return receipt?" sends the message as a critical message, but additionally returns a
message to you as users acknowledge receipt of the message.