Meta search engines work in various ways. With some, a single, simultaneous search retrieves results from multiple sources, usually with the duplicates removed. Others offer a separate search of multiple content sources, allowing you to select the source(s) you want for each search.
When a single simultanous search is offered, only a limited maximum muber of pages from each source are returned. The cut-off may be determined by the number of pages retrieved, or by the amount of time the meta engine spends at the other sites. Results retrieved by these engines can be highly relevant, since they are usually grabbing the first items from the relevancy-ranked list of results returned by the individual search engines. Keep in mind that complex searches, such as field searches, are usually not availlable.
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