deep web enabler

Search engines do not cover all the data available on the Web. They miss the data behind search interfaces. This data is defined as deep web which is not accessible through search engines. As far as I know, currently no product offers to search deep web content. There are various innovation required to enable deep web (Google did it for surface web). One of such kind is Alertfor, it monitors deep web site(s) for new “thing” for specific keywords / phrases.