real-time event

  event that a) occurs at the same time as the viewing and b) is not completely generated by the content

  A Webcast of a live performance (occurs at the same time as the viewing and is not prerecorded).

  An on-line auction with people bidding (occurs at the same time as the viewing).

  Live humans interacting in a virtual world using avatars (is not completely generated by the content and occurs at the same time as the viewing).