Results of a search:

 
 

Looking at someone's details (sparse in this case):

Looking at a list of available virtual address book's. Choosing select adds them to your first page:

Accessing the directory from netscape's address book (clicking on the little card to the left of my name would show the same details screen as above):

 

Using the directory in Netscape mailer to auto complete an email addressed to "joh...".  The search is performed by pausing. If there is only one entry that satisfies the search when you pause, it is automatically put in the "To:" box: