Describes Z39.50, a standard prepared by the National Information Standards Organization (NISO) for information retrieval that allows two computer systems connected to a network to exchange messages for the purpose of searching databases and receiving records. Canada's involvement is discussed, and possible library applications are described. (LRW)

A distributed union catalog is a network of bibliographic systems that cooperate to enable their users to discover sites that hold copies of known items. Some participating systems will be traditional union catalogs, others will be single sites with comprehensive collections, and others will be local or regional resource sharing systems. A…

The virtual Canadian union catalog (vCuc) project is a project among Canadian libraries to use Z39.50 (an information protocol standard) for searching distributed individual library catalogs and union catalogs. This paper summarizes the major technical, vendor, bibliographic data, and administrative issues that must be resolved before the…