Read this: informitv - Interactive standards debate promotes war of words
Summary: He claims that MHEG-5 has only been successful in the United Kingdom because manufacturers have no choice, not because broadcasters really use it or even offer sophisticated interactive services. MHEG-5 was originally developed in the mid-1990s and was accepted as an open ISO standard. It provides primitive support for basic interactive television functions but is regarded by some as rather limited compared to more complete programming languages. - informitv.com
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