At first glance we found Force Touch largely indistinguishable from a regular trackpad, although the ability to tap anywhere on the pad (rather than just the lower half) is a welcome move. It's also a credit to Apple's ingenuity that the Force Touch trackpad will enable the new thinner MacBook Air to have recreate physical depression.
Can developers use Force Touch in their apps?
Stock OS X applications have a different response to Force Click, and Apple has opened up the Force Touch API (Application Programming Interface) to developers so they can begin to explore Force Touch in their own apps.
Developers can download the Xcode 6.3 Beta and OS X 10.10.3 from the Apple Developer website to gain access to the Force Touch API and documentation.
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