If you've ever wanted a simple way to forward your Ports then you'll know they're few and far between. PassPort is a simple port forwarding utility which aims to take the pain out of port forwarding.
The program actually runs as an NT Service and can forward several ports from any local machine to a remote IP address of your choice. The program is managed with a simple Windows GUI interface which makes it accessible to all but the most novice users. The program makes things easier by avoiding the need to deal with NAT's. on your router.
If you use P2P software, then it's likely that you forward data to one of your ports. This is essential if you're going to achieve high speed downloads with a fixed IP address. P2P clients often need two or three ports to function at optimum levels. The most other common uses for this program are for those that don't have a direct connection to the internet or use FTP, SSH, or VNC services.
This will make port forwarding a lot easier although it's important you know what you are doing otherwise you could actually block applications from accessing the internet properly.