App properties
| DeviceType | Returns a text string indicating the type of the device running the app, or a blank value if the device is not known. |
| OperatingSystem | Returns a text string indicating the operating system of the device running the app, or a blank value if the operating system is not known. |
| Reference | Returns a reference to the app object. |
| UserEmailAddress | Returns the email address of the signed-in user, or a blank value if no user is signed in. |
| ZoomLevel | Represents the zoom level of the app, which determines the size of the user interface. |