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.