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Thanks for the fast reply! More specifically, based off of the link you just provided regarding multiple people signing up for an appointment, I want to set a maximum capacity for these appointments. For example, I want to have some sort of internal counter or variable which says that at most 5 people can sign up for this appointment. I have the existing ability to distinguish between users on my server, but I would like to find some meaningful way of ensuring that too many people do not choose one appointment time.