Fred Bauder stated for the record:
Here's an example of a minor secret which I would never divulge or publish:
I used to work for a company which had radio communications with a central dispatcher. We had a secret word which if used alerted the dispatcher that there was a serious problem. It was a pretty nifty system and as far as I know, none of the thousands of people who ever worked for that company ever let that secret out.
Which is not to say -- I hope -- that you would be opposed to an article on [[duress code]]s in general.