Unfortunately, the nomenclature of searching is not standardized, so you have to check the description for each search engine to see how its action can be controlled. This comes close to the kind of control experienced with the UW libraries' catalogue system , Willow. Engines based on following hypertext links . But since it exists in a hypertext environment, these engines pull in linked documents and check them as well. Unfortunately, many of them are off the subject or obscure uses of your search terms.
Some examples are . . .
Note here the use of WAIS-style points ranking the quality of the search hits. Note the Boolean capabilities, the extent of the document searched and the limitations on the hits one can set. By distinguishing between references and addresses, one can limit the repetitive entries from a spider search. Read more information on this interesting sub-species of Web search engines . Netscape's search pages CUI's search pages Specialized document databases .