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A spider is a program that browses (crawlers) web sites extracting information for search engine databases. Spiders can be summoned to a site through search engine registration or they will eventually find your site by following links from other sites (assuming you have links from other sites).
spider tips
Spiders do not read pages as browser do. They generally cannot execute JavaScript, including links performed by scripting, or frames links.
While spiders will explore your site using hyperlinks, they typically will only go so many levels deep. Therefore, it is likely that a visiting spider may not index your entire site. You may need to register multiple pages with a search engine.
If you have sensitive information you do not want indexed on a search engine you can use meta tags or a special instruction file to block them from certain pages.
Your web server logs can tell you when and what pages a spider has visited.