...can do so with the click of a mouse button. The data is sent on a portion of the broadcast signal called the vertical blanking interval. That is the black bar seen when a TV picture starts to roll vertically. Broadcasters already use that to...

...can do so with the click of a mouse button. The data is sent on a portion of the broadcast signal called the vertical blanking interval. That is the black bar seen when a TV picture starts to roll vertically. Broadcasters already use that to...