Security is not a big deal, The Win98 PC's are TCP/IP and the hub is connected to a linksys cable/dsl router so they can all get on the net, the workgroup is named RES and yes the XP machines workgroup is RES. When the XP machine is on that workgroup, all the Win98 PC's cannot access each other and don't even see anything when going to Network Neighborhood, but if the XP PC is shutdown, boom all the Win98 PC's can see each other in the Network Neighbor Hood and share files among them but once the WinXP PC boots up on that Workgroup, all the 98 PC's can no longer share printers and files etc.. but if I make the XP PC on a workgroup of RES2 then the 98 PC's can once again share and they see the RES2 workgroup but cannot access it although I have enabled sharing and added accounts for the users.