RPM postmaster -i ?

The docs say to startup, using postmaster -i (Internet?) switch - for TCP/IP
use.  They don't elaborate on where to properly implement postmaster -i.

Some of the places, I've uncovered where one *might* invoke postmaster -i
are:
    /etc/tc.d/init.d/postgresql
    pg_ctl
    pg_hba.conf
    CMDNAME

Maybe I'm missing something, but it seems like PostgreSQL won't even work
from another PC without postmaster -i ?  If so, I'm amazed at how vague the
docs are, regarding the proper place to implemement postmaster -i.  The docs
seem to assume that one is going to *manually* start PostgreSQL, rather than
auto-start it upon boot.  I'm also surprised that the RPM installation
doesn't setup postmaster -i.

Thanks for whatever light you might shed on this.  It's been a several-days
hunt, already - to find out.

Michael Coughlin