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Genesis of a TeX-based markup metalanguage

The TEXT1 text processing program at Washington State University, based on the mathematical typesetting program, Tau Epsilon Chi (TeX), written by Professor Donald Knuth of Stanford University, fits the role of a standard markup metalanguage, with the capability of providing an integrated approach to documentation. Like TeX, TEXT1 allows the use of different processing systems and output devices. The markup is accessed through an on-line interface that coordinates document creation, spell-checking, proofing, printing, and file management. TEXT1 is designed to work on laser printers and digital phototypesetters, but it also works on terminals and line printers.