A computer has access to plenty of random information. Any time you have a sensor, the lowest bits tends to be noise. Every modern processor has a temperature sensor. The lowest bits are hopelessly noisy, and it turns out that the noise is from quantum mechanics effects, so it is truly random.
The computer have a bunch of other sources of random noise like that, and the operating system will gather it and use it generate truly random numbers via API to the apps that ask for it.
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