How can I disable my USB port?

I need to temporarly disable my USB ports on my powerbook.

For what reason ever..
IF this is possible then I would take a deep look at the developer tools. Inside the /Developer/Applications folder is a USB device tool ( designed to develop and test USB drivers/software ) .
Only other way would be geeky hacking on the open firmware prompt, but I don't know the aliases or command that would be needed. You will however need to digg very deep inside the technical side of a Macintosh and get an understanding how OF and the Hardware Abstraction layer in OS X works and maybe unload manually some critical kernel extensions on boot-time.
Good Luck.

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