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Computer software for generating and providing indexes of computer networks, where the network may include the global computer network, an intranet, or a wide area network, namely - (1) providing host computer sites on the network with agent programs which extract data about resources on each host site, (2) gathering from host sites data about resources on each host site, (3) building a searchable index or catalog or database of resources on the network, (4) providing searches of the index or catalog or database of resources on the network, and (5) generating comparisons of indexed resources on the network