===== 3.3 process Method =====

All APDUs are received by the Java Card RE and preprocessed. All commands, except for the MANAGE CHANNEL command result in an instance of the APDU class containing the command being passed to the **process(APDU)** method of the currently selected applet.  

Note - A SELECT FILE APDU command might cause a change in the currently selected applet prior to the call to the **process** method. The actual change occurs before the call to the **select** method. 

On normal return, the Java Card RE automatically appends **0x9000** as the completion response status word to any data already sent by the applet. 

At any time during process, the applet may throw an **ISOException** with an appropriate status word, in which case the Java Card RE catches the exception and returns the status word to the CAD.  

If any other exception is thrown during process, the Java Card RE catches the exception and returns the status word **ISO7816.SW_UNKNOWN** to the CAD.