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The 1st layer contains the links to the 2nd and the 3d layers, and the 2nd layer contains the link to the 3d layer (i.e. there are two ways to reach the 3d layer: directly or via the 2nd layer). Let the 1st layer be currently active. An Alarm comes from the 3d layer. If recursive search is on and the Search for the shortest path checkbox is set on the 1st (active) layer, the link to the 3rd layer will blink. If the Search for the shortest path checkbox is not set, the links to the 2nd and 3rd layer will blink on the 1st layer.