Working with the serial console
Configure your Arch Linux machine, so you can connect to it via the serial console port (com port). This will enable you to administer the machine, even if it has no keyboard, mouse, monitor or network attached to it (a headless server).
As of Arch Linux 2007.x, installation of Arch Linux is possible via the serial console as well.
A basic environment for this scenario is connecting the administering machine to the administered machine, using a serial cable (9-pin connector cable).