16. The system of claim 14 , wherein the connectors are equipped to connect the preview engine to the search engine and to content servers, and the connectors are configured to: send a user search query to the search engine, receive search result lists from the search engine, and download the data files from the content servers to the preview engine.
14. The system of claim 13 , wherein the preview engine has at least a user interface manager, connectors, a content converter, a page indexer, and a cache manager.