Is there an instruction set that would enable me to turn off usbnetwork?  It was turned on by hitting the delete key and entering 
;debugOn
`usbNetwork
;debugOff
[BTW, it's not clear from the documentation that the "O" is capitalized, but it doesn't seem to matter.]
Is this part of the Jailbreak instruction set, or is it native to the Kindle, or part of the usbnet instruction set?  For instance, how would I turn off the feature, something like:
`usbNetworkOff
Would that work?
[Update: Never mind.  This Youtube video helped.  The instruction in debug mode is: 
`usbQa ]
http://www.youtube.com/watch?v=wyO5cjuqF4g