While playing Ghost Writer Webcam, the person typing is referred to as the Keyboard Man
Vince: So my friends and I decided to go on Chatroulette. I was keyboard man.
Hot Chick: You guys did a Ghost Writer Webcam?! I wish I could have been there!
On Chatroulette, a couple has sex while a friend types at the keyboard. The key to making it a success is to make the "keyboard man" invisible to the web cam.
Vince: So my friends and I decided to go on Chatroulette. I was keyboard man.
Hot Chick: You guys did a Ghost Writer Webcam?! I wish I could have been there!