But === This document is a computer description of the LIRE_RESU command, whose role is to read fields at nodes or fields by elements on a file in the format 'IDEAS', 'MED'. We find: * the list of the main routines used by the command, as well as a brief summary of their functionalities. * the routines to be modified to allow the addition of a new reading format, * the routines to be modified to add new result types as well as new fields as part of the IDEAS format. **Table of Contents**