On a Mac, press the Siri button if you have a Touch Bar or the Siri icon from the Menu Bar. Alternatively on a Mac, press Command twice. In the Siri request bar, input your question. Siri's ...
As for how it will work, there will be a Siri icon in the OS X menu bar that will ... When a user clicks the Siri button, a dark, transparent Siri interface will appear in the top right corner ...