Its good for writing and testing a Windows virus
I'll bet.
Not that I'd ever do that - but you can save the machine state anytime and revert to old saves so it seems like that's a good use for it.
"Whenever you find you are on the side of the majority, it is time to pause and reflect" --Mark Twain
"The significant problems we face cannot be solved at the same level of thinking we were at when we created them." --Albert Einstein
"This is still a dangerous world. It's a world of madmen and uncertainty and potential mental losses." --George W. Bush