The F-series infra-red keyboards contained a real-time clock; during the machine's boot sequence, the BIOS would graphically prompt the user to press the 'DATE/TIME' key. This would transmit the date and time settings from the keyboard to the computer via IR, setting the RTC in the computer. The Infra-Red trackball could also be used as a mouse by tilting the unit forward - the ball protrudes from the top and bottom of the unit and can roll on a surface. The units also shipped with fibre-optic 'Light Pipes' that can channel the IR signals, designed to prevent multiple keyboards and trackballs from interfering with adjacent machines in office environments where multiple F-series computers were (predicted to be) in use.