Emitted when devtools is focused / opened.
+### Event: 'app-command' (Windows):
+
+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.
+
+
+```js
+AppCommands = require('app-command');
+
+someWindow.on('app-command', function(e, cmd) => {
+ // Navigate the window back when the user hits their mouse back button
+ if (cmd === AppCommands.APPCOMMAND_BROWSER_BACKWARD &&
+ someWindow.webContents.canGoBack()) {
+ someWindow.webContents.goBack();
+ }
+});
+```
+
### Class Method: BrowserWindow.getAllWindows()
Returns an array of all opened browser windows.