VPN on a Cocoa app [closed]

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I'm developing an app for a customer. He has a company and he wants the app to connect to the oth开发者_Python百科er Macs via VPN. Does anyone know a good tutorial/guide for that?

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Apps don't VPN; the operating system does. Then your app just happily notices it's able to see a server it wouldn't otherwise have been able to had the connection not been present.