CrossRef - Information on the reference linking service using Digital Object Identifiers (DOI). The Truth About Federated Searching - Reviews five common misconceptions about federated searching services. [Information Today] List of Portal Application Functionalities for the Library of Congress - Requirements list for federated searching products, similar to a RFP (request for proposal) vendor format. From the Library of Congress Portals Applications Issues Group (LCPAIG). MuseGlobal - Java-enabled, hub-based, metasearch engine by Peter and Kate Noerr. Demonstrations and background information. Federated Search Engines and Link Resolvers - A weblog with progress reports, from the University of Pretoria. ZPortal - Product information on the Z39.50 search engine from OCLC PICA. Cengage Learning: General OneFile - A meta-search management system with overview and tour.