code: public void runAllSlot() {
  		moveToId(0);
  		System.out.println("== runAllSlot start at " + currentSlot + " ==");
  		while (isValidSlot()) {
  			if (currentSlot % 10 == 0)
  				System.out.print(currentSlot + ": ");
  			int flag = (Integer) getVal(currentPos(), INTEGER).asJavaVal();
  			System.out.print(flag + " ");
  			if ((currentSlot + 1) % 10 == 0)
  				System.out.println();
  			currentSlot++;
  		}
  		System.out.println("== runAllSlot end at " + currentSlot + " ==");
  	}
docs: Print all Slot IN_USE or EMPTY, for debugging