I have a firewall, nobody can connect
 

I am wondering, i read some about this file sharing thing. I was thinking maybe this thing could be what alows me to put up my POL(penultima online) server for use. Would this work? if so how?

-josh

What you need is assign the PC that uses Gnutella, or a server kind of application, a static IP address (say, 192.168.1.5). Then, in your firewall, forward the ports used by any such applications to that IP address. How this is done, depends on your firewall type, so you'll have to refer to the manuals for that. But I know that for Linksys routers, this can be set in the "Advanced" section.