This Recommendation describes an object-oriented programming language called "IPTV service enhanced script language (IPTV SESL)" based on LIME Script of ITU-T H.762 with enhanced functionalities. The language is used in IPTV service for performing computations and manipulating computational objects within an IPTV terminal device environment. There are two primary implementations of the specification, the "Core Script Profile" and the "Extended Script Profile". The Core Script Profile is conformant with the LIME Script of ITU-T H.762 and provides for the objects for client-side computation. The Extended Script Profile provides for functional extensions required for IPTV services.