I am reminded of two devices.Thanks, shtell01.
I guess then, that has to be turned-on while attached to the keyboard and then, in dormant or on-state can be detached to take it away.
And any saved material transfers automatically or by command, to the hard drive when re-attaches again, if not near enough for Wifi. The 'base' keyboard shuts off after a while sensing no display ? How wrong am I guessing ?