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Event Action definitions allow you to "inject" functionality into Campground Master by trapping, or intercepting, a specific change or activity in the program. There are many pre-defined "Events" in the program that can be intercepted and acted upon, and you can conditionally execute any expression in the context of that event. In many cases you can not only perform an action but also stop the event from completing. For instance, you can check new reservations for meeting certain criteria like minimum stays on holiday weekends, and not allow it to be saved unless it meets this criteria.
Most reservation status changes are trappable events, as well as some customer and transaction changes and dialogs. There are also some general actions like operator log-in and log-out, program start and stop, and timer events to allow an action to be performed every second, minute, hour or day.
As with all advanced customizations, this requires a rather technical understanding of the system. However it must also be emphasized that Event Actions are much more "dangerous" than any other customizations because they define actions that happen automatically, potentially changing the overall operation of the program, and also potentially causing a serious system malfunction.
Additional Topics:
Advanced Customizations Overview & other topics