+
+<sect3>
+<title id="filterfile">What is a <quote>default.filter</quote>?</title>
+<para>
+ The <quote>default.filter</quote> file is used to <quote>filter</quote> any
+ web page content. By <quote>filtering</quote> we mean it can modify, remove,
+ or change <emphasis>anything</emphasis> on the page, including HTML tags, and
+ JavaScript. Regular expressions are used to accomplish this, and operate
+ on a line by line basis. This is potentially a very powerful feature, but
+ requires some expertise.
+</para>
+
+<para>
+ If you are familiar with regular expressions, and HTML, you can look at
+ the provided <filename>default.filter</filename> with a text editor and see
+ some of things it can be used for.
+</para>
+
+<para>
+ Presently, there is no GUI editor option for this part of the configuration,
+ but you can disable/enable various sections of the included default
+ file with the <quote>Actions List Editor</quote> from your browser.
+</para>
+
+</sect3>
+