If you want to add NetBEUI, the instructions are at http://duxcw.com/faq/network/xpnetbeui.htm. I have found that adding NetBEUI in a network comprised of Windows XP and 9x/Me computers causes problems. Maybe that is why Microsoft removed it from the normal install options.
When sharing an Internet connection with Windows XP/2000/98 SE/Me, the TCP/IP Properties on the other computers should be set to get their IP addresses automatically from the Internet Connection Sharing (ICS) hostís DHCP (http://duxcw.com/faq/network/dhcp.htm) server, which is part of ICS. Also, the XP firewall should be disabled (http://duxcw.com/faq/win/xp/firewall.htm) on the clients. Larry