What's the configuration for a 2 switch/2 lamp circuit where one lamp's always ON
Can someone tell me what is the switch and wiring configuration for a 2 switch/2 lamp circuit where one lamp is always ON? This configuration is rarely used, but it IS used, nevertheless, in small apartment buildings where there is a hallway and a long, dark stairway to the upper floor. There are two lights and two switches, one at the bottom of the stairway, and one at the top. One light is ALWAYS on, but not both, so the switches alternate the power from one light to the other or in other words, throwing either switch transfers the power from one light to the other. - thanks, Tony