How can I connect computers in my LAN to the internet via 1 DSL modem (USB)
that can be connected only to 1 computer(obviously...) ? I've tried it
several ways but none worked.
To be precise, I need only 1 other computer to be connected to the net.

If you have a USB DSL modem, then you'll have to connect the modem directly to
one computer.  Then, you can run ICS on that computer, and all of the other
computer in the LAN (or the one you want anyway) can get Internet service.

Get the service working on the one computer.  Then run the Networking Setup
Wizard, and select Option 1, "This computer connects directly to the
Internet...".  Run the NSW on the other computers, and select Option 2, "This
computer connects to the Internet through another computer on my network...".

Note: The computer with Internet service will have IP address of 192.168.0.1 on
its LAN connection, and the others (any with which you may wish to communicate,
Internet service or not) will need addresses in 192.168.0/24, so you will want
to run the NSW, or simply activate the DHCP client, on each.

Here are a few websites with useful tutorials:
http://www.cablesense.com/
http://www.homenethelp.com/
http://www.practicallynetworked.com/
http://www.wown.com/

There are basically only two ways to do this.  Wired or wireless.  If your
modem has more than one ethernet terminal, simply use that to connect your
other PC.  The only other option is to go with a wireless internet
connection.  If your DSL modem is not also a wireless gateway, you will have
to purchase one that is or a wireless router.

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