Problem

You want to ping a URL each time an entry is posted to a given category.

Solution

Enter the URL in the outbound TrackBack URLs text box in the Edit Categories screen.

Discussion

As mentioned in the article entitled "Enabling a Category as a TrackBack repository", you can use TrackBack for more than just communication on particular entries. TrackBack pings can also be associated with categories in your weblog.

Likewise, users writing about Perl can set up MT to automatically notify specific TrackBack servers when a new post is made to an associated category. This allows remote sites to keep a repository of links across multiple Web sites. In a sense, this usage is "push" syndication.

To set up MT to ping a TrackBack repository when a post is made to a category, click Categories in the Weblog Toolbar. Click on the category name you want to enable and scroll down to the "Outbound TrackBack URLs to Ping" text box. Enter the URL(s), one to each line and finally press the Save Changes button at the bottom.