1. To make an object available for sharing with another applet in a different context, applet A first defines a shareable interface, SI. A shareable interface extends the interface javacard.framework.Shareable. The methods defined in the shareable interface, SI, represent the services that applet A makes accessible to other applets.

2. Applet A then defines a class C that implements the shareable interface SI. C implements the methods defined in SI. C may also define other methods and fields, but these are protected by the applet firewall. Only the methods defined in SI are accessible to other applets.

3. Applet A creates an object instance O of class C. O belongs to applet A, and the firewall allows A to access any of the fields and methods of O.