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The "tools" are save states.
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That, and slow downs (they speed them up to fit 'actual' gameplay), and turbo, and glitches that people woudn't normally be able to perform.
Look up Ultimate Mortal Kombat 3 speedrun and the guy litteraly kicks the crap out of the other without even being hit once and he performs stupid combos over and over, and look at the menu, he flys through it.