Explains how the Directory Service (CCITT X.500/ISO 9594) became an international standard in response to the difficulties of keeping data on information network users current and accessible. Uses of X.500 are described, a technical overview is provided, its functions and protocols are assessed, and directory projects and products are discussed.…

More than 100 data banks are listed with notes indicating the sponsoring agency, the type of material stored, where available, and the number of references stored annually. Characteristics of data banks, types of storage, descriptions of devices, and storage organization are briefly discussed in the introduction. Indexes to the data banks listed…

Profiles X.400, the Open Systems Interconnection (OSI) Application layer standard that supports interpersonal electronic mail services, facsimile transfer, electronic data interchange, electronic funds transfer, electronic publishing, and electronic invoicing. Also discussed are an electronic directory to support message handling, compatibility…