Fallback trigger

From ProxiPedia

A fallback trigger is one that executes if no other identically defined trigger fires. Consider the following example:

Suppose you have several triggers assigned to the Play button on an AirClick and you want to designate one of those triggers to only execute if no other AirClick play button trigger fires. For example, you might define a AirClick Trigger volume up and down to increase or decrease the volume in iTunes, but only if it is the active application. You define another set of volume up/down buttons and designate them as fallback triggers that adjust the system volume up or down. These triggers will not fire if iTunes is the active application. You could continue adding volume up/down triggers for various situations safe in the knowledge that if none of those trigger's conditions (filters) are satisfied then execution would fall back to the "fallback" triggers.