> What is the benefit of this "REWIND" feature? Just curious.
People use them to make so-called TAS (Tool-Assisted Speedruns) in which the player appears to make no mistakes and therefore can finish a game in the most optimal way. Every time they do make a mistake, which is generally over 10,000 times in a given playthrough, they use the rewind to try again. Emulators with full support for this will then also back up the recorded .inp or equivalent so when you play back the .inp it just plain looks like you're supernaturally good.
This technique is also useful for exploiting timing bugs in games, like finishing Mario 64 without getting any stars by flying backwards through the castle walls.
You can see many examples sorted by console at tasvideos.org.
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