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An EPG allows the viewer to browse program summaries, [[search]] by genre or [[television station|channel]], immediate access to the selected program, reminders, and [[parental control]] functions. If the device is capable of it, an EPG can enable one-touch [[television recording|recording]] of programs, as some [[DirecTV]] [[IRD]]s can do with a [[VCR]] using an attached [[infrared]] [[emitter]] (which [[emulate]]s a [[remote control]]).
EPGs are typically sent within the broadcast [[transport stream]] or alongside it in a special [[data]] channel. The [[ATSC]] standard for DTV uses tables sent in each station's [[PSIP]], for example. These tables are meant to contain the program start time and title, and additional program descriptive "metadata". In the U.S., these devices receive [[time signal]]s from local [[Public Broadcasting Service|PBS]] members, so that they can record on time. Most systems, however, rely upon third party "metadata aggregators" (companies such as Tribune TV Data or Gemstar TV Guide in the U.S. and Europe), to provide good quality data content. Newer media centres (PC based multi-channel TV recorders) and Digital Video Recorders may use an internet feed for the EPG. This enables two-way interactivity for the user so that media download can be requested via the EPG, or related link, and remote programming of the media centre can be achieved . An example is IceTV.
An example of an EPG system is [[Guide Plus]]+.
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