pgaccess and NULL values

Hello.

I use pgaccess for maintaining some of our tables, on a PostgreSQL
7.1.3 server. Sometimes I need to insert NULL values. However,
searching a little bit, I found this :

http://archives.postgresql.org/pgsql-interfaces/1998-02/msg00001.php

This article seems somewhat old. So now, does pgaccess supports the
NULL values insertion ?

Thanks in advance,
Nicolas.