if (instance == null) instance = new JSLDesktop();
if (instance == null) { synchronized (in_get_instance) { if (!in_get_instance.booleanValue()) { in_get_instance = Boolean.TRUE; instance = new JSLDesktop(); in_get_instance = Boolean.FALSE; } } }
    public static JSLDesktop getInstance() {	if (instance == null)	    instance = new JSLDesktop();	return instance;    }