JavaCard OS

I have downloaded the new JCIDE. And it's an excellent tool for java card developers I think.
But when I program my Hello world applet, I have two questions.

- Where will be the bytes sent if we used the method APDU.sendBytes() ?
- From where APDU.getBuffer() retrieves bytes?

A1: Method sendBytes() causes the card to send a number of bytes to terminal from current APDU buffer.
A2: Method getBuffer() returns a reference to a byte array buffer contained command data sent from terminal to the card.

If you use JCIDE to run your applet, you may communicate with the simulator.