A given app will, reasonably enough, only see the IDBFS-provided file 
system specific to itself. But how is it decided *which* IDBFS object 
belongs to which app? A bit of experimentation shows that the same app in 
different locations is not deemed to be the same app. But there is clearly 
more to it than that because two replacing one version of the app with a 
different one under the same name is also detected as an app-change. On the 
other hand a certain amount of change to the controlling HTML file and to 
the C code being converted is tolerated as not constituting an app change.

So how is access actually determined? What advice do I give my users? 
Clearly relocating the app is a bad idea -- one loses any accumulated 
persistent data. Is upgrading to a later version safe? At what point does 
an upgrade become an app change?

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