Q. What is the Microsoft "Fix it" option on some knowledge base articles?

As the name suggests, certain Microsoft Knowledge Base article now have a Fix it option that calls a program to resolve the issue described in the Knowledge Base article.
You can find an example at http://support.microsoft.com/kb/282402, which describes the Internet Explorer (IE) restriction of two concurrent file downloads. The Fix it option modifies the download limit to 10 concurrent files by running an MSI file that sets the documented registry key in the KB to 10.
Microsoft has a full blog on the Fix it, which lists all the available Fix its