Two Simultaneous TCP/IP Protocols

As long as you are using two seperate conections its a piece of cake. For example two nic cards or one nic and one usb adapter. Then set each connection with the proper ip addressing.
If this is not what you are looking for then post back specificly what you are trying to acomplish.

No, that's not the case, I'll try to ellaborate. It's two LAN connections using TCP/IP on one NIC in one machine. Both connections use DHCP. One connection uses different DNS settings.
Thanks

Actually you can do, but you have to do some configuration steps to get it to work. There is an excellent how to article here:

http://www.windowsnetworking.com/articles_tutorials/multiipa.html

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