Event Message
A message, initiated by the event system, sent from one system user to another, that, in many respects, simulates an email message.
Event messages are created by event actions of a Notify or Prompt type, or by Inbox activities such as Forward, Reply, and Reply All.
Event messages appear in the Sent Items folder of the sender, and the Inbox of each recipient.
For more information about event messages, see "Event Messages" in the Guide to the Application Event System.