Do you remember starting a desktop computer in the 1990s, it power button, a momentary switch, now cars, trucks and SUV's feature smart keys and a start stop button, a momentary switch, different that a light switch which holds the position on or off, momentary switching only create a close circuit when your finger depresses the switch on a spring, which shorts the wires leading too it, sending a signal to a circuit controller or something electronic, which turns "it" on, but holding the switch down for many seconds can trigger a restart, shutdown or other function depending the device, noting your automobile a device or system of devices, often with more than 8000 parts made me dozens of companies, designed by people like you or me on computers.
What happens if you hit the cars start button when driving? Usually dash or display blinks an error, to let you know that is not a valid input, but if you hold down the start stop button you can turn off the engine, but you will lose power steering and power breaking and this could cause an accident, so be cautioned not to do this, except as thought experiment related to buttons pressed to start computers.
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