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New Book Information

Hi everybody, as subscriber, I’ve received a mail in which I’ve read a great news:this winter will be published a new book - macOS by Tutorials, First Edition!!! It’s a great news.
But I’ve a question: what is explained? this is not a stupid question because I would like to know what is explained to learn to create Mac OS app. is explained how to create an universal app that works also in Mac OS? Or are explained all components of AppKit and how to use them to create a native App Kit app?

thanks

p.s. the second would be great