This standard describes the DLL routines and functions that must be supported by the software driver for a SCR.\nThe specification covers DLL versions available, functions that the DLL must support, the associated status and error return codes needed for the reader and application development rules that must be followed in building the DLL. The application development rules include structures declared in calling programs, size allocated for the structures (including that for backward compatibility) and steps to communicate with the smart card via the reader, using API commands. Other functions that are required in the standard reader interface are also specified.\nThe syntax, description, parameters and return values of the API commands are also specified in the document.\n