On-line help and information are available at several levels. General descriptions of the database and applications are proposed through various menus. One can easily recover the names of the commands, the content of the files or the descriptions of the options. In addition, each command and function is (or will be) described in a manual file. A rapid help on the command syntax to use to obtain the desired results is available with an on-line menu which offers also many examples. Similar command description is also available in hypertext form and can be displayed with NCSA Mosaic.