1. A digital video recorder (DVR), comprising: at least one memory device; a communication access point for receiving at least one program play; an open application programming interface associated with said at least one memory device, wherein a plurality of applications using said open application programming interface (API) allow a user to interact directly with a display of the program play, based on metatags associated with at least one prevalent object appearing in one of the programs plays, wherein said metatags provide for viewer interactivity directly with the metatagged object appearing in the program plays, and wherein the interactivity includes access to externally accessible media, information in the world wide web advertising and/or purchasing points external to the DVR and having a predetermined relationship with the metatagged object of the program plays; a correlation engine in communication with said open application programming interface, wherein said correlation engine relates metatagged object in a portion of one program play and corresponding interactivity provided thereby, to metatagged similar objects appearing in others of the program plays, and in other portions of the same program play, for use by at least a portion of the plurality of applications that use the open API to employ correlation functions and correlation branching with regard to program plays accessible DVR; and an instream metastream that is correlated to the program play shown to the user, said instream metastream being thematically unrelated to the program play.