The Comms Centre app is a central list of all the messages, both electronic and paper-based, that get sent to the students in other apps. It stores draft communications, as well as pending (queued) and sent messages.
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To delete, edit or send any of the messages in the Comms Centre you will need to visit the Comms Log tab from the relevant app.

The relevant app is displayed in the App column in the Comms Centre.