When Microsoft came out with their extension, and then it eventually ended up in HTTP/1.1 (or at least some version of it), we pivoted to a primarily client-side product that offered read-ahead caching, metasearch (could perform a query on multiple search engines like Hotbot, Altavista, Infoseek, etc. -- this was pre-Google) and save and integrate the results. It would also then rerun those queries periodically and highlight new results, and you could save or bookmark.
We also used that search technology in a product that would monitor trademark use, which companies used to keep track of where and how their trademarks or brand names were being used. We never made enough to keep that side of the business running, while the web consulting/development side grew and grew. These were pre-2000 days when businesses were wanting to "get online".