code: public static void writeState(String fname) {
      try {
        persData.store(new FileOutputStream(fname), Calendar.getInstance().getTime().toString());
      } catch (FileNotFoundException e1) {
        e1.printStackTrace();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
docs: Write the state of parsing for all open log files to a property
  file on disk.
  
  @param fname the filename of the property file to write to