Spiders or web crawlers are part of the automated search engine tools. They go to a site, "crawl through it, and send back to the search engine the information that it finds so the saearch engine can index it. If you have run any Airstream specific searches on Google you will see that the forum comes up in most of the top 10-15 links. This is because the spiders are always searching the site and adding to the Google database.
WBCCI #5501 AIR # 49
1978 Argosy 28 foot Motorhome
Wise men talk because they have something to say; fools, because they have to say something. -- Plato