Example for Checkpoint
If your page is being continually updated, inform the user that they should reload the page often (rather than by doing it for them).
For example, in HTML, don't cause pages to auto-refresh with "HTTP-EQUIV=refresh" until user agents allow users to turn off the feature. The following code would cause the same page to "refresh" or reload itself every 60 seconds. Presumably you would do this because you are changing the content of that page frequently.