I have a couple kiosk type machines that run keynote all day. I'd like them to shut down and start up at certain times. The machines wake and start at the scheduled time fine. On startup the keynote opens and plays.

The problem I have is with the scheduled shutdown. I use the Energy Saver preferences to schedule the shutdown, but since keynote is running I get that "Unable to logoff" message when it goes to shut down. Is there a way I can schedule a shutdown in Energy Saver, but force it to shutdown without keynote interrupting the shutdown process?