question about managing multiple databases

Hi. I was wondering if there was any way to have one database up in full
accessibility mode, (i.e. usr/local/pgsql/bin/postmaster -i -D /usr/local/pgsql/data)
and another in just local host
(i.e. /usr/local/pgsql/bin/postmaster -d 2 -D /usr/local/pgsql/data -h
127.0.0.1  -i)

Any help on this would be appreciated.
Thanks,
--Chris Hayner