The Java Card RMI message protocol consists of two commands that are used to:

• Get the initial remote object reference for the Java Card RMI based applet. The initial remote object reference is the seed remote object that the CAD client application needs to begin remote method invocations.

• Send a remote method invocation request to the card.

To ensure that the protocol is compatible with all applications, the SELECT FILE command is used for getting the initial reference. The response to the SELECT FILE command allows the remote method invocation command itself to be customized by the applet.