This section allows you configure specific inbound ports/services to open or become accessible from the Internet to computers or devices on your LAN network by activating a trigger port. For specific applications on computers or devices, initial communication is made outbound to the Internet on a specific port which is known as a trigger port. Once the trigger port is activated, the assigned inbound ports will automatically be forwarded to the computer or device that activated the trigger port in order to allow the specific application to make use of the additional features or ports/services required for these ports. Another protocol that has automated this configuration process for special applications is UPnP (Universal Plug and Play) and NAT-PMP (NAT Port Mapping Protocol). Both UPnP and NAT-PMP can simply be enabled or disabled and will work automatically without any additional user configuration.