These are not like the ones seen on really old homes. I know that kind. For those, there is one button for on, and another button for off.
These switches I am referring to only have one button. Theyíre kind of like a rocker switch in a car. Pushing the top portion turns the light on, and the bottom portion turns the light off. You canít tell from looking at the switch whether theyíre on or off because after you push them they return to the middle.
In some places, there are up to 3 switches in a row. Each one controls a different item.