You can get a few examples of User Manager API here
http://help.adobe.com/en_US/livecycle/9.0/programLC/help/index.htm?content=000436.html#1570861.Also
look at the findGroupMembers method from the DirectoryManager API at
http://help.adobe.com/en_US/livecycle/9.0/programLC/javadoc/com/adobe/livecycle/usermanager/client/DirectoryManagerServiceClient.html.Jasmin