The Red Link Recovery Live tool can be used in two ways. Firstly, you can use it to check a specific Wikipedia article for red links and see suggested alternate targets for them. Or, if you prefer, you can view a short list of red links with suggested alternate targets, or search for particular types of red links. All of these options are available along the top of this page.
Clicking on blue and red links will take you to the relevant Wikipedia articles to allow you to fix red links, just as you would while editing normally. Some links may also have green AUTOFIX links beside them. These will only work if you make a small change to your Wikipedia "Custom JS" file. The location of this file depends on the skin you have chosen to use. Go to the Wikipedia preferences page, choose the "Appearance" section and click the "Custom JS" link beside your chosen skin.
The line to add is:
For an example, see User:Topbanana/common.js.
Autofix links open up an article in edit mode with some changes pre-applied, ready for you to review and accept. They will never make changes to Wikipedia without your permission.
Red links in articles are read from the Wikimedia Toolserver database. A wide variety of methods are used to suggest alternate targets for them. Many are similar to those used by the Red Link Recovery Project - for example checking to see if making small changes to a red links capitalisation or diacritic marks will make it match the title of an existing article. It also uses a technique based on the double-metaphone and Levenshtein algorithms, in a very similar way to major search engines. While the results of the latter method are generally less accurate, they can be generated on demand.
Under previous incarnations of the Red Link Recovery project, inappropriate entries in lists were marked up as 'exceptions' by project members and retained to ensure that they would not appear on future lists.
There is now no mechanism for project members to manually mark up entries as exceptions. Instead, the number of times an editor has looked at each suggestion is recorded. Entries that get looked at several times without being fixed are probably exceptions and will be set aside for special processing. You can have a look at the list of these 'old' links here.