Following a slime trail is also part of the hunting behaviour of some carnivorous slugs. Body mucus provides some protection against predators, as it can make the slug hard to pick up and hold by a bird's beak, for example, and the mucus itself can be distasteful.
1 Push button: The WPS button is either on the product or a clickable button on a wizard or utility screen.  Personal Identification Number (PIN): The PIN is either on a product label or can be viewed on a wizard or utility screen.
Update: i have the Belkin g wireless router and it has a button labeled WPS i just wanna know what the button does, when i hold it for a while, it makes the security light flash.