How does the iZip application interact with the DropBox app, since they’re both sandboxed?
As I see it I have full access to DropBox from within iZip, but I’ve heard that inter-process communication on iOS is limited.
Does iZip use DropBox’s API, or are there different ways to do this?
Having full access to the dropbox of a user doesn’t require interprocess communication. It’s just that the app uses the Dropbox client library for iOS to get authenticated by the user, and the developers of this app requested full access when they were registering their app with Dropbox.