This glossary defines terms and abbreviations from:

• The IBM Dictionary of Computing, New York: McGraw-Hill, copyright 1994 by International Business Machines Corporation. Copies may be purchased from McGraw-Hill or in bookstores.

• American National Dictionary for Information Systems, ANSI X3.172-1990, copyright 1990 by the American National Standards Institute (ANSI). Copies may be purchased from the American National Standards Institute, 11 West 42 Street, New York, New York 10036. Definitions are identified by the symbol (A) after the definition.

• The ANSI/EIA Standard-440-A: Fiber Optic Terminology. Copies may be purchased from the Electronic Industries Association, 2001 Pennsylvania Avenue, N.W., Washington DC 20006. Definitions are identified by the symbol (E) after the definition.

• The Information Technology Vocabulary, developed by Subcommittee 1, Joint Technical Committee 1, of the International Organization for Standardization and the International Electrotechnical Commission (ISO/IEC JTC1/SC1). Definitions of published parts of this vocabulary are identified by the symbol (I) after the definition; definitions taken from draft international standards, committee drafts, and working papers being developed by ISO/IEC JTC1/SC1 are identified by the symbol (T) after the definition, indicating that final agreement has not yet been reached among the participating National Bodies of SC1.

• X/Open CAE Specification. Commands and Utilities, Issue 4. July, 1992. These definitions are indicated by the symbol X/Open after the definition.

• ISO/IEC 9945-1:1990/IEEE POSIX 1003.1-1990. These definitions are indicated by the symbol ISO.1 after the definition.