As a sample application, the Recoll KIO slave could allow preparing a set of HTML documents (for example a manual) so that they become their own search interface inside konqueror.
This can be done by either explicitly inserting <a href="recoll:/..."> links around some document areas, or automatically by adding a very small javascript program to the documents, like the following example, which would initiate a search by double-clicking any term:
<script language="JavaScript"> function recollsearch() { var t = document.getSelection(); window.location.href = 'recoll://search/query?qtp=a&p=0&q=' + encodeURIComponent(t); } </script> .... <body ondblclick="recollsearch()">