Abstract: In one embodiment, a method includes obtaining a link to a video program; obtaining metadata that relates to the program and that defines, for a specified time point in the program, annotations to be invoked at the specified time point; wherein the annotations comprise: a graphic image; one or more filters, each of the filters comprising a key and one or more matching values; and optionally a reference to a video segment, an electronic document, program code statements, or a programmatic call; during playing the video, detecting that the video program is playing at the specified time point; in response to the detecting: for each particular annotation for the specified time point, retrieving a current value for the key, and causing to display the graphic image associated with that particular annotation only when the current value of the key matches one of the matching values of one of the filters.

Abstract: A computer-implemented method comprises determining, at a companion device separate from a television, a current time point of a video program playing at the television, wherein the current time point of the video program is a time point currently being displayed at the television; identifying, based on said determination of the current time point of the video program and based on metadata defining a cue point associated with the determined current time point and an operation associated with the cue point, an operation to be performed; performing, at the companion device, the identified operation; wherein the method is performed by one or more computing devices.

Abstract: A system for enabling nodes of a client-server network to interact with broadcast program content, the system includes a server node that can detect the presence on the network of one or more client nodes; a trigger extractor that can extract program-synchronous triggers from within the content of a broadcast program; and an application manager that, in response to extraction of a program-synchronous trigger from a broadcast program, can facilitate interactive communication, relating to the broadcast program content, between the server node and one or more client nodes whose presence on the network has been detected.

Abstract: In one embodiment, a method includes obtaining a link to a video program; obtaining metadata that relates to the program and that defines, for a specified time point in the program, annotations to be invoked at the specified time point; wherein the annotations comprise: a graphic image; one or more filters, each of the filters comprising a key and one or more matching values; and optionally a reference to a video segment, an electronic document, program code statements, or a programmatic call; during playing the video, detecting that the video program is playing at the specified time point; in response to the detecting: for each particular annotation for the specified time point, retrieving a current value for the key, and causing to display the graphic image associated with that particular annotation only when the current value of the key matches one of the matching values of one of the filters.

Abstract: A system for enabling nodes of a client-server network to interact with broadcast program content, the system includes a server node that can detect the presence on the network of one or more client nodes; a trigger extractor that can extract program-synchronous triggers from within the content of a broadcast program; and an application manager that, in response to extraction of a program-synchronous trigger from a broadcast program, can facilitate interactive communication, relating to the broadcast program content, between the server node and one or more client nodes whose presence on the network has been detected.