vBulletin Manual - External Data Provider

Besides the main forums, the search friendly archive and the printable version of a thread, you can also choose to turn on the external data provider. (Settings > Options > External Data Provider)

Here you can select which type can bse turned on/off. You can choose between javascript, rss and/or xml.

Enable External Javascript
This setting allows you to enable/disable the Javascript content syndication system that allows you to embed vBulletin data in HTML pages.

If you set this option to 'yes', you can call it by going to:
http://www.example.com/forum/external.php?type=js

You could use javascript directly in your html pages to control the returned data.
Enable RSS Syndication
This setting allows you to enable/disable the RSS content syndication system.

If you set this option to 'yes', you can call it by going to:
http://www.example.com/forum/external.php?type=rss

(example) There is a news-plugin for Trillian which lets you use RSS feeds to get the latest information posted in your Trillian program.
Enable XML Syndication
This setting allows you to enable/disable the XML content syndication system.

If you set this option to 'yes', you can call it by going to:
http://www.example.com/forum/external.php?type=xml

When you are done, click the [Save] button to apply the changes.