My iPad as touchscreen Mac (kinda sorta)

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Laptops with touch screens are pretty much the norm these days, with a prominent exception: Macintosh notebooks.

Apple has stubbornly refrained from adding fingertip interaction to the displays on its MacBook-branded notebooks while accommodating touch aficionados in other ways: With gargantuan trackpads, for instance, and a cool but controversial MacBook Pro Touch Bar.

So what’s a touch-y Mac user to do?

A company called Astro HQ goes part of the way to solving this problem by...