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Trigger variables are pieces of information that pass from trigger to trigger. They allow triggers to fire based on another trigger's behavior, state, and/or output. A variable can be a required condition for a trigger to fire; for instance, a trigger might be set to launch when a reservation starts, but only if it has received a variable from another trigger indicating that a specific node has started first. Variables give greater flexibility and power to a site administrator who wants to automate certain tasks and system behaviors.