How to get list of users using JNDI/LDAP (for a given group)?

I was wondering if someone answer the following 
question:

- How to retrieve the list of users that belong to a particular LDAP
group? Ldap server being used is Netscape (or SunOne) iPlanet directory
server.

It does sounds like a simple question but surprisingly I am not able to
find a clear answer for this. Ideally I would like to see the sample 
code.

Thanks,

Sudhir