Not sure why you would need the IP addresses to share information between PCs, provided they are on the same subnet, or have access to it through a router it would be moot. What you do need is a common User Name in all PCs. Add to the User List at least one identical user name and password on all the PCs that you want to share with. Set the user as a Standard User or, in XP, a Power User. You do not have to log on with this user, nor would you want to, you just need the identical User Name, Password and Group information in each PC's User Account. That should do it.
