1 Introduction 1.1 Overview over this manual Chapter 1 is concerned with the technical details of installing and running this package. Chapter 2 explains how GaussForHomalg works and what you need to know to extend homalg with your own rings. Also included in this manual is a documented list of the most important methods and functions for this linking process. Anyone interested in source code should just check out the files in the gap/pkg/GaussForHomalg/gap/ folder (--> Appendix A). 1.2 Installation of the GaussForHomalg Package To install this package just extract the package's archive file to the GAP pkg/ directory. By default the GaussForHomalg package is not automatically loaded by GAP when it is installed. You must load the package with LoadPackage("GaussForHomalg"); before its functions become available. Please, send me an e-mail if you have any questions, remarks, suggestions, etc. concerning GaussForHomalg. Also, I would like to hear about applications of this package. Simon Goertzen