More concretely... the traffic will go out of the computer? Will the NIC send out the request for the 2nd IP to the LAN and will answer itself, or will the traffic somehow stay inside the computer?
OS: Windows (2003, 2008)
I'm focusing on Windows, but the question is mostly theoretical, as I was trying to go into the fine details of how requests are routed in different scenarios (one of which includes having both the source and the destination IP on the same box). :)