Three-way switches are convenient devices that allow, when two are used together, lights to be switched from two locations. When two three-way switches are used with a four-way switch, lights can be controlled from three different locations. By adding additional four-way switches, you can add even more locations for switching.
...Source: http://electrical.about.com/b/2013/09/09/dissecting-a-three-way-switch.htm
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