http://drupal.org/node/219584 is the thread

The title probably sounds alien for users new to Drupal so before I explain what the improvement is about, I'll explain what a code patch is in the CMS called Drupal.

In Drupal, (a CMS or more accurately a web construction toolkit) is constantly updated and improved every day. As with most software, a collection of improvements is released as a new version such as Drupal 5.1, Drupal 5.2 etc..

In between each release, the software code in Drupal is improved by creating and then applying what is known as a code patch.

In Drupal 5.6 and Drupal 6.0 when a user goes to a page and clicks a link called configure on the following page: