The present invention teaches a method and system for uniquely defining and identifying events within a streaming media program. Programs and additional content can be stored with inband data in the stored content and that inband data can be dynamically updated, to include additional information such as instance counters, when the stored content it is requested by a rendering device. The additional information is used to uniquely identify the rendering of the program or additional content to allow a rendering device to perform actions based upon those unique identifiers.