An instructor can send messages to all participants at once via the Participants page. Follow the steps below to send a message to everyone in a course.
Locate the Navigation block, My courses, open the sub menu for the course and click the "Participants" link to see a list of participants.
Click the "With selected users..." dropdown menu and choose "Send a message."
Take a look at the message. Make changes as necessary then click "Update," otherwise, click "Send message."
The message will be sent to everyone in the course.
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