On Aug 16, 2011, at 12:46 PM, Abdul Sowayan wrote:

> My question is regarding options such as ApplePersistenceIgnoreState. Where
> did this come from? Is there some documentation that lists similar options I
> can use?

Any code can use the NSUserDefaults API to check the existence/values of values 
like these. So there’s just a lot of code all over the system (and inside apps) 
that checks for various options, whenever it was useful for 
debugging/testing/compatibility.

Some of these are documented, but not in any central place, and the majority of 
them are probably just passed around as folklore. In general you can’t depend 
on undocumented ones, since they could change or be removed at any time.

—Jens_______________________________________________

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