Although the custom folders make Northern Light unique, the search engine is recommended here because it supports an array of advanced search commands. Google, Alta Vista and Northernlight are among the top five search engines. While Google usually provides more relevant results, the other two support search strategies impossible on Google that are occasionally necessary, particularly for broad expansive searches. There are other good search engines in addition to these three. Over 20 major search engines are listed at Search Engine Watch.
Most search engines are case sensitive.
For the most part, it is best to use lower case letters except for proper names. Often you will find what you need simply by typing in a few keywords. Many times, however, you will benefit from using Boolean operators, which are simply the commands 'AND', 'OR' and 'NOT'. George Boolean, English mathematician. The diagrams below, known as Venn Diagrams, are the best way to show how Boolean commands operate.