Calling into Appointments from the frontend

Hi!

I have a client with Appointments+ installed which runs the booking system for their business. I have been asked to write some functionality that would reside on a 'normal' (non-admin) page, that needs to be able to call into Appointments+ to trigger the confirmation email routine, called send_notification().

Can you give me a short example of how I would do that? I'm bouncing my head off the wall here!

Many thanks!
Cam