At one point I worked on an over-the-horizon radar, where the control room was at the receiver site, about 100km from the transmitter site. It had changed by t

At one point I worked on an over-the-horizon radar, where the control room was at the receiver site, about 100km from the transmitter site. It had changed by the time I was there, but the old techs used to tell of having to enter the bootloader, for the computer at the transmitter site, via radio link. If the link went down, you had to start again...