An array of strings defining the commands for which the speech recognizer object should listen.
Setting this property when the speech recognizer is already listening means that the current command list is updated and listening continues. The items in the array should be
NSString objects. The command strings must match the current locale of the recognizer, which is selected in the Dictation pane of Accessibility system preferences.
Configuring Speech Recognizers
The title of the commands section in the Speech Commands window or
nil if there is no title.
A Boolean value that indicates whether the speech recognizer object should only enable its commands when its application is the frontmost one.
A Boolean value that indicates whether the speech recognizer object should block all other recognizers (that is, other applications attempting to understand spoken commands) when listening.