Contingency plans/Insurance policies?

The most common name I hear for the majority of these is 'contingency plans', but they are sometimes called 'insurance policies' like in the TV show NCIS (When Sheppard, Gibbs and their dead friend use one...).
These are basically packets of information that can be found by a codeword or symbol, but only by certain people if they know the code and where to look. They are usually used to find a person who has gone missing, or gain clues as to who may have killed someone. They are used a lot in undercover work in federal agencies apparently, but I figure that they could possibly be of some use to any RLSH out there in case they need to go into hiding or something. So I thought I'd bring it up for discussion as a method of preparation for crime fighting... Any comments?

Hrmn...I just have will.  It's one place I know that people will look after I'm gone.

Of course, I don't have any urgent information to pass along (no murder evidence or huge conspiracies after me), but it's a convenient place to place information.

-Rook

@Superman: Eastereggs are only with computer files, contingancy plans/insurance policies are a broader term. They are pretty much the same thing though...

@Rook: It doesn't nessicarily mean that. An example of how it might be useful would be if the mob found out your identity and trashed your place while you weren't there with the promise of coming back to find and hurt you, because you've been dobbing them in to the cops or something. In that scenario you might have a close friend/family member who would know what to look for in order to find a location where you might be in hiding if you suddenly dropped off the face of the Earth without a trace, so then they could help you out until it blows over or some shit like that. They wouldn't even have to know about your alter ego, just where to look in case you disappeared... And that's only one example of many.