You really shouldn't be setting your computer to DMZ if it's going to be accessing the internet.

Go to Advanced - firewall:

Select Enabled
Name: gnutella
Allow
WAN *
LAN (Your machines local IP address - perhaps 192.168.0.100)
TCP 6346

Then click Apply.

And do a little research. If I can find multiple P2P clients for Atari STs then you shouldn't have problems finding them for a Macintosh.

Requeries are just that. If a phone is busy, you dial back later.

Just because you have the DivX codec, doesn't mean you have the appropriate DivX codec - there are many of them. Lots of files will be encoded in DivX 4/5, for example. I'd say that a good 40% of the files that will play on my Linux box with MPlayer, Xine, or aviplay will not play on my GFs Windows machine with WMP or The Playa. (We just don't update the Windows codecs due to spyware, etc.)