@Samu93,
An electronic switch in the form of a disk inserted in a socket, to control a lamp for instance, by toggling, alternately switched on or off with successive application of power. This device would permit two lights or other appliances on the same circuit to be controlled independently
For instance Sam abover my bed I have a fan with attached light, at bedtime wish I could turn on just the fan without the need to unscrew the bulb
I keep hoping such a thing already exists but so far no luck finding it