Headless Pismo needing pre-login screens

Hi, I have a Pismo without a display that has an external monitor attached. With the help of forum members I am able to have full functionality of this machine once I log in.
However, I am hoping to find if there is a way to get a displayed screen prior to logging in. For example, if I hold down the "C" key to boot into my system disk, or hold the "Option" key for selecting a boot disk, or for accessing Open Firmware, or for Single User Mode.
I was hoping that there might be a way to change the default display for booting or if there was some keyboard shortcut that someone knows about.
Thanks in advance.

Shermo,
I cannot think of a workaround for your configuration except to alter a setting in Open Firmware. Here is a very brief explanation of OF:
http://docs.info.apple.com/article.html?artnum=24605
With some Googling, you can find out which version of OF the Pismo runs and some basic settings that can be changed. However, your configuration presents a problem; the default display for your Pismo is the powerbook's LCD and this is what Open Firmware will try to use. The Pismo will still boot into OF but you will have no way to view it.
My only suggestion is to just sleep the powerbook and display (or turn off the display but turn it on before waking the 'book), not turn them off. Since you apparently are using the Pismo as a desktop-only, I see no reason to shut it down...it can sleep in this low-power mode indefinitely.

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