anchor.diff:  NOTE: The index of a tailer is only progressed when the `DocumentContext.close()` is called.
   If this is prevented by an error, the same message will be read on each restart.
   
  +'''
   * *7. Command line tools - reading and writing a Chronicle Queue*
   
   Chronicle Queue stores its data in binary format, with a file extension of `cq4`:
  
positive.code: queue.close();
  ----
  
  5. Putting it all together
  
  [source,Java]
  ----
  
negative.code: As Chronicle Queue doesn't partition its topics, you get total ordering of all messages within that topic.
  Across topics, there is no guarantee of ordering; if you want to replay deterministically from a system which consumes from multiple topics, we suggest replaying from that system's output.
  
  '''
  * *4. Tailers and file handlers clean up*
  
  Chronicle Queue tailers may create file handlers, the file handlers are cleaned up whenever the associated chronicle queue's `close()` method is invoked or whenever the Jvm runs a Garbage Collection.
  