Notifications of appointments in Agenda screen?

[Nathan Neff <nathan.neff@gmail.com>]

Hi all,

I seem to recall a feature in org-mode that would show
notifications for upcoming appointments, scheduled items,
deadlines, etc. in Emacs itself.  For example the status bar
would have a red notification saying "Dr Appointment in 15 minutes".

I'm looking all over, and all I can find are posts about how to set
up org-notify to call some external messaging app.  I'm on OSX and
don't want to purchase "Growl".

I found org-notify.el,
(https://github.com/p-m/org-notify/blob/master/org-notify.el)
but it seems to require a "notify" property on any headline that you
want to be notified
of.  I would like org-mode to automatically notify me (on the status
bar, etc) for
any headline that has a time associated with it.

I also don't want to rely on an external program because I use org-mode
on different systems.

Any ideas for a simple notification system that would "pop up" a
message in Emacs itself, or
on the status line?

Thanks,
--Nate