✎ javacard:jcre:6.2.4_shareable_interfaces [wiki]

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==== 6.2.4 Shareable Interfaces ====

Shareable interfaces are a feature in the Java Card API to enable applet interaction. A shareable interface defines a set of shared interface methods. These interface methods can be invoked from one context even if the object implementing them is owned by an applet in another context.  

In this specification, an object instance of a class implementing a shareable interface is called a Shareable Interface Object (SIO). 

To the owning context, the SIO is a normal object whose fields and methods can be accessed. To any other context, the SIO is an instance of the shareable interface, and only the methods defined in the shareable interface are accessible. All other fields and methods of the SIO are protected by the firewall. 

Shareable interfaces provide a secure mechanism for inter-applet communication, as described in the following sections.

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