Users can view the latest news chronologically in the <a href="@aggregator">main news aggregator display</a> or by <a href="@aggregator-sources">source</a>. Administrators can add, edit and delete feeds and choose how often to check for newly updated news for each individual feed. Administrators can also tag individual feeds with categories, offering selective grouping of some feeds into separate displays. Listings of the latest news for individual sources or categorized sources can be enabled as blocks for display in the sidebar through the <a href="@admin-block">block administration page</a>. The news aggregator requires cron to check for the latest news from the sites to which you have subscribed. Drupal also provides a <a href="@aggregator-opml">machine-readable OPML file</a> of all of your subscribed feeds.