Apple MacOS Sierra Open Siri method:
Currently, the virtual helper is very useful in the desktop system, like its role in the iOS system, where users can easily start it with a keyboard shortcut.
According to the report, if you are a developer and have installed the first beta version of MacOS Sierra, you may have tried the "Fn + SPACEBAR" shortcut key combination to open the Siri voice assistant, and with the release of the second beta release, the shortcut key combination has changed.
From now on, the user will want to open the Siri voice assistant, you need to hold down the command key and the space bar, this is the previous OS X version called Spotlight shortcut key combination, the only difference is that the user needs to hold down the space bar, rather than tapping.
Of course, if you prefer to use the "Fn + SPACEBAR" To open Siri, you can make changes in your system preferences.