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my question is simple, how FB messenger know who is connected with the other FB app, i mean that in ios, apps use sandBox but when you are connected in the ‘normal’ app as ‘xy’ and you open the messenger one it ask you if you are xy ? and if you disconnect from the ‘normal’ app and you open the other again it ask you to connect. how those apps are connected together ?
thank you.
Two apps from the same developer can access the same keychain group.
More information can be found for example here.