I'd like to use a pair of LED-lit Bulgin anti-vandal momentary switches as power and reset buttons respectively, but I don't know what the heck "momentary" means. Does it mean that you press the button and it stays depressed, and you gotta press it again to get it to spring back? Or does it mean that it bridges an electrical connection for as long as you press the button, and it disconnects it as soon as you stop pressing it? ?????