cake events

Hi. I am implementing a Message system (ie, user A sends a message to user B). After user A sends a message to B, I would like to show the number of unread messages. One way of implementing this is to check for any new messages on every page refresh. Could I instead use trigger a cakephp event? Can I trigger an event in user A's session and have the listener be in another (user B) session? Thanks.

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