A. If Index Server is installed on IIS4, Front Page will default to use that as it's search engine.
If no catalog has been built with Index Server for that web, the search component will return "No Documents Found". Either index the site using Index Server, or in the frontpg.ini file (found in %systemroot%, e.g. d:\winnt) add "NoIndexServer=1" which defaults Front Page to use it's built in search engine instead of Index Server.