This feature is for Internet applications which normally cannot work through the built-in firewall. If an Internet application does not work, you can try defining it here. You will need detailed information about the application from the provider of the service or application. Note that the terms "Incoming" and "Outgoing" refer to traffic from the client (PC) viewpoint.

Operation is as follows:

1. When outgoing traffic from a PC uses an outgoing port defined as a Special Application, the Router records the PC and Special Application.
2. When an incoming connection is received which uses an incoming port for that Special Application, that traffic is forwarded to the PC. (Without the Special Application entry, the incoming traffic would be discarded.)

Note the following limitations:

• Only 1 PC can use a Special Application at any time. After each use, there will be a "time-out" period before the next PC can use the same Special Application.
• Each Special Application must use unique port numbers. You can not enable 2 Special Applications which use the same port number.
• The Special Applications feature is triggered by Outgoing traffic. So it will not help with incoming connections. (The Virtual Server and DMZ features can be used to determine the destination for incoming connections.)