Stop walking across a dark room to turn on the light. Install a 3-way switch and control lights from two locations.

It mentions that if a light fixture is between ... conventional colors? In the diagram on the link they are using a three conductor cable after the first three way switch. Black, Red, and White ...

My house was built in the 50s, with wiring from ... the existing switch is a 3-way switch? But I read these have to be used in pairs, except no other switch affects this light.

No matter which switch you flip, the light responds. You may find other configurations in your home. Hire a pro to diagnose anything you're unsure about, but here's how to wire a 3-way switch with ...