Should I fire the 'attentionscreenshow' event?

In the 'UtilityTray.js', the `handleEvent` handles some touching and the 'screenchange' events, and other 3 events, the 'home', 'emergencyalert' and the 'attentionscreenshow', in the same case. I've found that the 'screenchange' would be fired when the screen got black out because timeout, and obviously the 'home' and 'emergencyalert' will be not what I can use. So the last one option is the 'attentionscreenshow'.