scrollPane.getViewport().add(desktopPane);
getContentPane().setLayout(new BorderLayout());
getContentPane().add(scrollPane,BorderLayout.CENTER);
/* instantiate the device object to interact with the hardware */
nf2 = new NFDevice(DEFAULT_NF_DEVICE);
if(nf2.checkIface()!=0){
System.err.println("Cannot find interface "+nf2.getIfaceName());
System.exit(1);
}