Sharing/network PC<=>Mac

I hope this message is IT.

A while back I set my PC (Windows 2000 Standard) and my Macintosh (iBook
with OsX, now 10.3.9) to mutually share the Internet connection and their
hard disks. Only the PC is connected with an USB modem to ADSL. Here are
the few settings I made:


PC

IP: 192.168.1.10
Subnet mask: 255.255.255.0
=====
Macintosh

IP: 192.168.1.11
Subnet Mask: 255.255.255.0
Router: 192.168.1.10
DNS Server: 192.168.1.10

I made no other settings.

The iBook can thereby access my PC's hard disk, use the Internet and
download any kinds of files. I have two problems, though.

1) I wish to use a P2P programme on my Mac, which, as I've written, is not
directly connected to the net. I need ports 6881 to 6889. Other people have
solved this problem by forwarding such ports, but everybody talks about
routers, and I don't have a proper router, do I? It's my PC, I guess. I
suppose I've tried and possibly even managed to forward those ports in the
settings of my remote connection, but after some reboots Azureus (the P2P
programme) still gives that "NAT Error". Someone else suggests using other
ports, like 53000 to 63000.

2) The PC locates the Macintosh with its name and icon, but can't access it
any longer: it says it can't find the path. It was able to access it in the
past: a window appeared in which to type the username and the password I
usually type in my Mac to use it. The same way I still do when I want to
access my PC from the Mac. This way it works. Since I reinstalled OsX and
reset the parameters, my Mac has been able to access my PC, but not vice
versa. I've eliminated the icon of the Mac with the old name in the PC, and
this has allowed it to locate the Mac again with its new name, but it still
can't access it.

Thanks for your attention.


Bye, FB
--
"Oh oh... Oh my God. My parents are having an affair."
(Gilmore Girls - 512)