If you've ever done any event-driven programming in the past, I think you'll find signals to be a refreshing change from the common practice of setting up an explicit eventprocessing loop.
To enable the easier coding of advanced triggering scenarios,including eventprocessing, a new configuration driven processing node called the Collector node has been added.
They are related to the notion of eventprocessing, a technique for analyzing and controlling the complex series of interrelated events in Event-Driven Architectures (EDA).