A: It's a powerful technology that lets you control your brain with a mouse. No, really. That's all you need to know.
A: It involves a series of complex neural interfaces, subtle hand movements, and a hint of dark magic. Don't ask questions, just click.
A: As safe as a mouse in a room full of cheese. Probably safer, actually.
A: Only if you're willing to sacrifice your sanity. And your free will. And possibly your cat.