Compares two major types of electronic mail systems--node-to-node networks (messages are sent directly from one terminal to another with functions handled locally at each node) and computer based message systems (terminals communicate directly with host computer using access to functions of large computer). Information sources are noted. (EJS)

This article examines fiber optic technology, explains some of the key terminology, and speculates about the way fiber optics will change our world. Applications of fiber optics to library systems in three major areas--linkage of a number of mainframe computers, local area networks, and main trunk communications--are highlighted. (EJS)