This part of IEC 62516 describes the T-DMB common application program interface (API). It provides a software platform that@ when combined with the T-DMB O/S@ forms a universal interface for application programs. This interface allows application programs to be written in such a way that they run on any T-DMB receiver unit@ as described in IEC 62516-1:2009 and IEC 62516-2:2011 regardless of its manufacturer. This part of IEC 62516 also defines a software environment that allows multiple application programs to be interoperable on a single receiver unit by sharing the fixed resources of the receiver@ and it provides a set of interfaces that the T-DMB middleware and the ASIC specific software use.