brotherton-erpnext/erpnext/docs/user/manual/en/using-erpnext/messages.md

You can send and receive messages from the system by using the Messages tool. If you send a message to a user, and the user is logged in, it will appear as a popup message and the unread messages counter in the top toolbar will be updated.

You can choose to send message to all the users, or to specific user.

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