We have introduced another new feature today entitled "@mentions". Example, if a user types into a topic the "at mentions"; @@Tom_Test, that will cause a notification to be placed in tom_test's notifications box, if he / she has configured @mentions to allow that. That way, upon signing in, a user has immediate access to those posts where he/she has been mentioned.
You will now see a new function in the information to the left of every post; the @Mention link. By clicking on that link it automatically opens up a new message with @mention to the poster inserted for you.