Emitted when devtools is focused / opened.
-### Event: 'app-command' (Windows):
+### Event: 'app-command':
Emitted when an [App Command](https://msdn.microsoft.com/en-us/library/windows/desktop/ms646275(v=vs.85).aspx) is invoked. These are typically related to keyboard media keys or browser commands, as well as the "Back" button built into some mice on Windows.
});
```
+__Note__: This event is only fired on Windows
+
### Class Method: BrowserWindow.getAllWindows()
Returns an array of all opened browser windows.