See my Comparing Search Engine Capabilities comparison chart or the search engine help sheets to see how these proximity operators are used by the different search engines. Field Searching Field searching allows you to narrow your search. The fields could be searching the title of the Web page only, or limiting to an image, address, domain, language, or media type. See my Comparing Search Engine Capabilities comparison chart which will show you what fields are available for searching using which search engine. The help sheets for each search engine will also provide you with examples so make sure you check these as well.
Some search engines recognise capitalisation.
To illustrate this, if you are looking for information on Mr. Bill Gates and don't want information on gates that open and close, using capitals will narrow your search. Thanks to Susanna Grey-Smith for the Venn diagrams.