What can I do with Open Firmware

can someone give me some basic commands for open firmware? I just want to tinker around with it a bit.

I'm afraid there probably won't be very many replies about a topic like that here. Messing with the Open Firmware of your iBook could, potentially, be a warranty-voiding operation. Topics about things like that void your warranty are not usually allowed here.
There aren't many Knowledge Base articles about Open Firmware, but here are two:
http://docs.info.apple.com/article.html?artnum=93772
http://docs.info.apple.com/article.html?artnum=42642
Even after more than ten years working with Apple computer/Macintosh technical support, I've never had to do more than reset Open Firmware as described in the second link.
-Doug

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