To cast your Tripltek 8 to another Tripltek or Android device, Go to the Play store and download the CastReceiver APP https://play.google.com/store/apps/details?id=com.softmedia.receiver.castapp&hl=en_US&gl=US on the device you want to use as a monitor.
On your Tripltek 8 you want to use as a main device to cast , go to the Notification panel , select Cast and select the Tripltek device you are going to use as a monitor.