How would I unauthorise DE from a computer?

I've just purchased by first e-books and have read the six max computers authorised rule.
I've loaded digital editions onto the first one, and done the authorising thing.
But if at some stage in the future I want to deauthorise that computer, how would I do that?
GB

I too would like a comprehensive answer to this question.  I'm about to replace my desktop computer.  At which point, I'll remove everything from its harddrive including Digital Editions.  This is fine because I'll be able to authorise a new machine, but what if I keep my eReader for several years, and in that time work my way through a number of different computers (and/or operating system reinstalls)?  At some point I will reach my limit and, if machines can't be deauthorised, my eReader will become useless.
So can you deauthorise a machine AND 'reclaim' an extra authorisation?
If not, what are you supposed to do in the senario above?

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