Activators connect two Nodes.
They activate or inhibit their target Node based on the state of their origin Node and a specific Condition.
The Activator’s Label specifies this Condition.
If the state of the origin Node meets this Condition, then the target Node is activated (it can fire). When the Condition is not met, the target Node is inhibited (it cannot fire).
Watch this example of how Label Activators work. Notice how state changes in Pool A affect each Target Source, according to the Label on their respective State Connections.