1.1 Introduction

The installation of the Amsterdam Density Functional program package (ADF) on your computer is explained in the Installation manual. This User's Guide describes how to use the program, how input is structured, what files are produced, and so on. Some special applications of ADF are described in the Examples document.

Where references are made to the operating system (OS) and to the file system on your computer the terminology of UNIX type OSs is used and a hierarchical structure of directories is assumed.

The ADF package is in continuous development to extend its functionality and applicability, to increase its efficiency and user-friendliness, and of course to correct errors. We appreciate comments and suggestions for improvement of the software and the documentation.