If you have WiFi enabled and setup, along with Protected WiFi options on the router set up and if you have WiFi enabled devices like a wireless printer that also has Protected WiFi set up. Then what you do is hit the button on the router once, this sends our a signal for say your wireless printer to pick up. Then you hit the button on the printer. This starts communications between the 2 devices and automatically sets up the connection between the two. Once it's connected wirelessly, then you would go to the PC and set it up on the pc normally following the printer mfr setup instructions. Just all depends on what WiFI devices you have that support this Protected WiFi setup. I don't have any so I disable it in the router. This is not to be confused with WiFi itself. These are separate options, however Protected WiFi setup is dependent upon WiFi itself being enabled if your going to use it.