It's also known as the "idiot button"
This morning, a CD got stuck in my CD drive. I kept pressing the button and nothing would happen. I went into Windows explorer, right clicked and hit "eject CD" -- nada. I restarted the computer to see if that would help, pressed the button again... bupkus.

So I shot an e-mail off to the I.T. help desk. Over scurries the techie known as "Sprocket" due to his similarity to the Mike Myers SNL character, Dieter, with what looks to be a paper clip that he's stretched out into some sort of jimmying device. He scowls at my CD drive and announces that he is going to have to take it apart.

"Are you sure it won't come out?" he asks.
"Yeah," I say.
He presses the button, and voila! Out pops the CD.
D'oh. I hate giving the techies a reason to feel superior.