How To Stop Two People Booking The Same Appointment Time

Feb 1, 2011

As the title states, how can i stop two users from booking the same appointment time.

Example, two users logging, on there screen they can both see that a 1pm appointment is available. They both try to book themselves into that appointment time.

How can i stop this from happening and ensure only one user can book it, then refresh the screen to show the next available booking time to the other user.

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