i don't know the tutorial but I will tell from my experience.
To share internet connection, we can use a proxy server like SQUID.
First you install webmin from www.webmin.com
(it makes configuration easier).
then configure SQUID as you want.
then you will have to edit file /etc/systcl.conf (In Fedora 7. Dunno in Knoppix) and
change the net.ipv4.ip_forward to 1.
then restart network services.
then on each windows pc, setup IE to use proxy server @ your port num (usually 3128 for SQUID if unaltered).