With the release of ArcGIS 10.2, ArcGIS GeoEvent Processor for Server is replacing Tracking Server as Esri's primary server technology for real-time GIS.
With Tracking Server, you can collect and distribute real-time data to Web and desktop clients. It is an enterprise-level technology that integrates real-time data with GIS.
By bringing real-time data into GIS, you can share information quickly, easily, and efficiently and help your end users make better decisions. Tracking Server is used for many different applications including automated vehicle location and real-time tracking of assets.
With Tracking Server, you can
Receive data in any format and transmit it to distributed clients.
Perform filtering and alerting based on attributes of the data or spatial positions (geofencing).
Log data into ArcGIS for Server or distribute it directly to clients including ArcGIS for Desktop Tracking Analyst extension or Web clients.