Processor elements in a GeoEvent Service perform real-time processing of event records as they are received. In ArcGIS GeoEvent Manager, double-click the Processor element from the New Elements list to add a processor to a GeoEvent Service. The processor can be configured to support real-time event data processing workflows.
Step-by-step instructions to add processors to a GeoEvent Service are included in the introduction to GeoEvent Server tutorial. You can also access the tutorial from GeoEvent Server tutorials.