A class that needs to be shared through the applet firewall must implement the Shareable interface.
The PIN interface represents a PIN value and its validation methods.
The ISO7816 interface contains static fields that represent constants of ISO standards.
A JavaCard applet that wants to pass control to an other JavaCard applet must implement the MultiSelectable interface.
The MultiSelectable interface identifies the JavaCard applet which implements it as capable of several concurrent selections.
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