Configure NIC for DHCP regedit: o HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\%GUID% o Select the IPAddress key and double click it. In the Edit Multi String dialog box enter a second (and third and so on) IP address. o Select the SubnetMask key and double click it. In the Edit Multi String dialog box enter a second (and third and so on) Subnet Mask. Disable/Enable NIC Windows 98: This trick can also be accomplished with Windows 98, only there you need to modify the following registry path (instead of the one in step 2 above): HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Class\NetTrans In Windows 98 you'll also need to reboot your computer for the trick to work.