Well! In brief
what you can do is to buy a 16 Port Hub, put an extra network card on the PC with the Internet Connection and the connect this to the hub, after that install Win98 SE and the use Internet Connection Sharing( LAN and not Dialup).
Afcourse all th other 15 PC should be networked via the hub.
This works and infact i am currently using a PC connected by these means.