In brief, a spider is a computer program that prowls the Web, chasing down hyperlinks and detecting any new documents it encounters. Working tirelessly, a spider can discover hundreds of thousands of Web documents, and add their URLs to a database. When you select one of these categories, you see a list of search services, with a text box and search button for each.
Coverage is very comprehensive.
The page is difficult to access during peak usage hours. Another unified search interface that enables you to type key word just once. You search just one service at a time. This is a unified search service that, like the W3 Search Engines page, provides you with a list of search services, each with a search text box. The coverage isn't nearly as comprehensive as Internet Sleuth .