Paul,

Yes, that's what I meant: a "serial operated cotactor" with push buttons. Is there no shorter word for this in English? In Dutch we call it a "Impulsschakelaar" - schakelaar meaning switch. We use them very often over here whenever we have 3 or more switches for 1 light e.g. long corridors or stairs. What do you use in England in such circumstances? 3 and 4 way switches? Even when you have 5 switches? Hre it would be seen more like a recepy for spaghetti. [Linked Image]
Another application is when the push buttons are next to swimming pools, then we use a 12V or 24V version. We can then use very thin wire fore the switches e.g. 0.6 mm2.