OOOOPPPPPSSSSS ... I had the wrong info ....
Here's the correct info:
http://www.apple.com/support/itunes/store/authorization/
QUOTE
When should I deauthorize my computer?
Please deauthorize your computer before you send it for repair, upgrade it, sell it or give it away. To deauthorize a computer, choose Deauthorize Computer from the Store menu in iTunes.
How do I deauthorize all of my computers?
If you have authorized five computers, a button labeled "Deauthorize All" will appear in your Account Information screen. This button will deauthorize all computers associated with your account. You can then reauthorize up to 5 computers. Note: You can only use this feature once a year.
Thanks, Jim, for pointing out the error!!!!!!!