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It depends on how your circuit is configured. If the switch controls the master power for the PC, if you open it (sw in off), the power to the PC will be cut, and it will not have enough time to shutdown (unless it is a laptop with a working battery, of course). If the switch controls the ingnition pin in your shutdown controller (i.e. you wire it instead of the ignition switch of the car), if you open it will have the same effect as putting your ignition switch in off, normally instructing your PC to shutdown.
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