If you want to cut a sheet of paper, you use a paper cutter to do it. But if you do not have that, you could fold the paper and tear it along the folding line. The former is "hardware", the later is "software". If you can do it by hand, why do you bother to go to another room to find the paper cutter to do it? Note that a pair of scissors will do the job too. For some reason, scissors are called "software". ( I am talking about UARTs, CPU only, or Timers ;)
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