For me it's ski race timing Software. Need a USB dongle and timing computer(a proprietary device that logs timestamps, prints and translates pulses offa wire into start and finish events to the PC Software) via USB. There's a lot of moving parts to manage, things like power to the USB, sleep etc. Bricking a ski race where thousands of volunteer, kid and coach hours have been spent in preparation for it is a nightmare. Last season our windows machines were in a Windows update death spiral on race day. The timing operators had no clue how to overcome it.