INT DC - PCIBM PC/370 v4.1- - API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running. Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes. SeeAlso: INT 60"PCIBM PC/370"