Database security?

Smartclient's reference manual page about the server.properties file only describes how to access the database server with a single username/password. Is there a way to allow multiple database users logged in through a Smartclient GUI component? What about authenticating database access in Smartclient GUI objects with an SSL key? i.e., how can I implement this:

http://www.postgresql.org/docs/9.3/static/auth-methods.html#AUTH-CERT