The screen is not designed to be removable however if you were adventurous I suppose you could. There are 4 small screws attaching it to the PCB above the water pump fan. There is a shroud that sits on top of the screen that is removable though.
There are 4 cables coming from the AIO. The first is labeled Fan1 and connects to the two radiator fans. there is a CPU fan header for reporting the radiator fan speed. A SATA power cable for powering the pump obviously. Finally, a USB connector. The USB connector is what is necessary to control the display. The files are all stored on the computer and, to my knowledge, nothing is stored on the AIO itself.