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 a processor element from the element tray onto the canvas or by double-clicking the processor element—in either case, a properties dialog will open, allowing you to configure the processor.
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.