Sharper edges (german accent??)

I'm watching a great training dvd from 3d fluff on how to make a box modeled remote control. Things are going great but my host, who has a german accent, has instructed me to hold down a key and drag. I would be more than happy to do so, but I can't understand her. She seems to be saying something like the "full stop key" or the "for shtop key". When she does it the edge she has selected in the hypernurbs object is becoming sharper. Does anybody know what key you would hold down, while dragging the mouse, to do so this? I'm at a loss!