AutoVacuum Daemon

Hi, I want know if I should run the auto-vacuum daemon (from
/etc/init.d/) or it runs automatically and transparently if configured
in postgres.conf?. If it must be configured manually, what is the script
to be run, I didn't find pg_autovacuum or similar.

I didn't find information about this on this page:

http://www.postgresql.org/docs/8.4/static/routine-vacuuming.html#AUTOVACUUM

P.S.: I'm on linux running PostgreSql 8.4

Regards,
--
Leonardo M. Ramé
Medical IT - Griensu S.A.
Av. Colón 636 - Piso 8 Of. A
X5000EPT -- Córdoba
Tel.: +54(351)4246924 +54(351)4247788 +54(351)4247979 int. 19
Cel.: +54 9 351 6629292