> Normally for shared preference or data you would write to a shared file in 
> /Library/Application Support/companyname/filename, but you have to take 
> special care if you're sandboxing your app.

Indeed. It would seem this requires to be root.

> Never write into your application bundle.  It will fail in many cases, most 
> notably: read-only file systems and App Sandbox.

So, what should I do?

> You best bet is likely to turn to Core Foundation, which has built-in support 
> for not only multi-user but also multi-computer: 
> https://developer.apple.com/library/mac/#documentation/CoreFoundation/Conceptual/CFPreferences/CFPreferences.html#//apple_ref/doc/uid/10000129-SW1
> You will likely need to programmatically synchronize the CF prefs with the 
> user prefs if you want to use them with NSUserDefaults.


> That is correct, and also you'll need to do this in a privileged helper tool. 
>  If you are fortunate enough to be requiring Mac OS X 10.7 or later, read 
> Nathan de Vries' article on the topic…
> http://atnan.com/blog/2012/02/29/modern-privileged-helper-tools-using-smjobbless-plus-xpc/

Thanks for the links. "Luckly" enough, my app is 10.7+
Isn't resorting to a SMJobBless helper tool endowed with XPC capabilities just 
for storing a few must-be-global preference a little overkill?

Jean
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