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To transfer information between two applications working with the same account on iOS, several approaches can be used:

• App Groups and Shared Container: allow applications from the same group to exchange files and data through a shared container.
• UIPasteboard: a shared clipboard that can be used for transferring small data.
• URL schemes (Custom URL Schemes): to launch one application from another with parameter passing.
• NSUserDefaults with App Groups: for storing and reading shared settings.

For example, using App Groups allows applications to read and write data in a common directory:

let sharedDefaults = UserDefaults(suiteName: "group.com.example.myapp")
sharedDefaults?.set("value", forKey: "key")

This is the safest and recommended way to exchange data between applications of the same developer on iOS.