> Even FTP is available. Now I will set a way
> to keep connected with my NT box. NFS or something.

Samba. NFS clients for Windows aren't free. So you probably don't have one unless you need one for some specific reason.

> Weird, I cannot map locally my NT box( second computer
> on the Hub). I must past by my ISP and get back in my
> appartment(Inet IP addresses).

Something is very wrong there. You should never have to go to the outside world to get on your internal network. Unless you don't really have local network setup (like the NT machine only have a public IP).

> But I don't see how I can set 2 IP addresses on
> the same network card with my linux box...
> ppp0 then ppp1 ?

You want multiple address on a single ethernet card? In your /etc/sysconf/network-scripts directory you will find a file called ifcfg-eth0. Copy that to ifcfg-eth0:0, edit it, remove all of the IPX stuff, change the IP to something else, and the interface name to eth0:0 (or whatever your file is).
You also have to have alias support in your kernel.

j