How can i assign multiple IP addresses to an NIC (possibly software solution)?

How can i assign multiple IP addresses to an NIC (possibly software solution)?

I am connected to a network that assigns my IP address via DHCP, but i also need to assign my NIC an IP address that is not in the network's address range. Is this possible, maybe with some "virtual network interface"? Preferrably so that both networks work? I'm running Windows XP.