Text to Search For: Here is where you type what you are looking for, for example Baroque instruments.
Boolean: Using the above example, if this option is set to AND, then the search engine will look for pages that contain both the words Baroque AND instruments. If this option is set to OR, then the search engine will look for pages that contain either the word Baroque OR instruments.
Case:
If the case is set to InSensitive, it tells the search engine to ignore whether or not words are capitalized. In this scenerio, Baroque will yield the same results as the word baroque. If you set the case to Sensitive then it searches for the exact word(s) you type, specifically if they are capatialized or not. With the case set to Sensitive, the word Baroque and baroque will yield totally different results.