That’s where Touché comes in. The app simulates Apple’s new touchscreen display for shortcuts by bringing up a row of Touch Bar options for whatever software you’re using on your Mac, on your screen. This helps to give you an idea of the functionality the Touch Bar will bring you on a new MacBook Pro, without having to use the cumbersome simulation tool from Apple (which also requires Xcode).
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Touché requires the latest build of macOS 10.12.1 and can be invoked with a keyboard shortcut. That’s handy for people who just want to see what all the fuss is about (without actually buying a new laptop) and for developers who want easy access to the virtual Touch Bar, whether to test their app shortcuts or to take screenshots of it in action with their own software.