LATEX runs on a variety of computers at many different sites. This document tells you how to use LATEX with emTEX on computers running OS/2, MS-DOS or PC-DOS. It is not about LATEX itself, which is described by the manual—LATEX: A Document Preparation System, published by Addison-Wesley, available at fine book stores everywhere.
If you have a question about running LATEX that you can't answer by reading the manual and this document, ask Eberhard Mattes. He should also be informed of any possible LATEX bugs or undocumented anomalies.