History
A few years ago, the DVB project started the development of a Java-based application platform (a set of APIs), called MHP, intended to support software applications running on digital television platforms. Such applications could include Electronic Program Guides (EPG's), interactivity, Video on Demand (VOD), email through your television, etc. The MHP specification defines the download of MHP applications ("xlets") over transmission networks based on other DVB specifications (i.e. over-the-air or terrestrial networks using DVB-T, satellite networks using DVB-S, cable networks using DVB-C). As other specification bodies such as CableLabs and the Blu-ray Disc Association chose to base their own DTV software standards on MHP it became necessary to define a subset of MHP which removes the transmission-related elements of the MHP specification but retains the application API's, thus allowing broad content compatibility across a range of delivery platforms. Recently the DVB project made GEM the primary middleware specification and released a self-contained version of GEM in ETSI TS 102 728 .
Read more about this topic: Globally Executable MHP
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