Unique number assigned to an applet instance or a Java package.
Data unit exchanged between a smart card and a terminal at the application layer. An APDU contains either a command or a response.
Protection mechanism that enforces applet isolation and separates the system space from the applet space. In the firewall scheme, each applet runs within a context (object space). Applets cannot access each other's objects unless they are defined in the same package (and thus share the same context) or through well-defined and secure object-sharing mechanisms supported by the Java card platform.
It defines calling conventions by ...