Processors can be added to a GeoEvent Service to perform real-time processing of GeoEvents as they are received. In GeoEvent Manager, you can add processors to a GeoEvent Service by dragging and dropping or double-clicking the Processor element from the New Element list. A dialog opens allowing you to configure and add the new processor to the service designer canvas.
See What are processors? to learn more about the processors available with GeoEvent Server.
Step-by-step instructions illustrating how to add processors to a GeoEvent Service can be found in the Introduction to GeoEvent Server tutorial. Access the tutorial from GeoEvent Server tutorials.