In principle, one can construct and/or modify VO directories with any LDAP tool which provides directory update capability. However it is possible to change something you shouldn't change which may break other software. In order to limit the possibility of corruption, several tools have been developed to assist in administration and management of the VO database by the various classes of managers/administrators. Some of them are available from the DataGrid Authorization Working Group:
http://cvs.infn.it/cgi-bin/cvsweb.cgi/Auth/VO/sbin/
The other tools have been ``baked'' at NIKHEF by David Groep and are available at
http://www.dutchgrid.nl/DataGrid/appsThese tools assume that your workstation has the basic LDAP client-side tools installed. This is standard on Solaris systems. On Linux you might need to install it. At NIKHEF for example we have openldap-1.2.9-6. You also will need Perl installed (blech) with LDAP and Tk support enabled.
Finally, a general-purpose LDAP browser will be useful. You can get one at the following web site:
http://www.iit.edu/gawojar/ldap/.
This tool can edit LDAP directory information (given that you have permission) as well as browse it. If you just want to browse and not edit, you can use Netscape 4.X (or MS Internet Exploder).