In LiveCode desktop apps, you can't put stuff in the mainstack of the app or 
its substacks and expect it to be there next time the program is run: there are 
often questions on this list about this kind of thing. The basic rule that 
prevents self-modifying programs in modern OSs means that the mainstack is 
essentially read-only, so saving of the main stack and its whole data tree is 
not allowed: the traditional solution is "put your data into a different stack 
which you open at the start of the program and save when it quits" (the Splash 
Screen method).

Now, what about iOS? As far as I understand the iOS app concept (which is not 
very well), the whole thing runs in the app's sandbox, and when the program 
quits or is suspended (same thing, in effect), the entire state of the app is 
recorded. If this is true, then you might think that when an app creates new 
cards in its main stack, then those cards will still be there when you restart 
the program. My experiments show that they aren't - this is not unexpected 
exactly, but it raises the question: what is kept in the sandbox - is it only 
stuff that has been deliberately saved in the 'documents' folder or whatever? 
Or is some other status information stored by the system and if so what? Can I 
know for example how many times my app has been launched on this device? I 
expect there is something about this deep in the XCode docs but I have not 
found it. Does anyone know?

Graham

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