how do i enable a laptop to connect to two domains using the same username and password

I have users that need to do work on both domains (with two-way trust relationships), but they are getting tired of changing their IP addresses settings each time they have to do the work.  I hear that they have purchased USB attached ethernet "cards" to keep from having to change the on-board NIC's settings.  The onboard NIC uses DHCP and the external NIC will use a static IP.  Is this advisable and will it cause other problems down the road?
alendozoAsked:
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schmedroeCommented:
Some of my users have used software utilities in the past for multiple network access, to simplify things for some users all they would need to do is use the correct nic card jack when they plug in to either location. A usb nic card can easily be plugged in at second location.
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schmedroeCommented:
Using a laptop with dual nics or an external usb nic card works great! Installing an additional card is much easier than changing ip's!
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JasonStitzelCommented:
I have a similiar scenario.  I travel with my notebook computer and work on-site at several clients.  Each has different network configuration.  I use a free application called NETSETMAN (Network Settings Manager).  You can install this on the notebook computer and save your configurations.  Then just open the application, click the configuration you want and click activate.  It will change IP settings, default printers, etc...

Give that a try.

http://www.netsetman.com
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Brian PiercePhotographerCommented:
You can't have a laptop (or any other machine for that matter), in more than one domain at any time - no matter how many NICs you have !

There are some utilities such as http://www.netswitcher.com/
and http://www.globesoft.com/mnm9_home.asp

that can simplfy switching between domains
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alendozoAuthor Commented:
Hi everyone - I need to clarify something.  The user won't be connecting to two domains at the same time during the same session.  He does work in two buildings which have their own domains.  He's getting tired (and making IP setting mistakes) of changing the IP settings each time he wants to connect either Domain/network.  Hope that makes this more understandable.  Thanks!
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alendozoAuthor Commented:
As a newbie in this area, I was looking for anyone that has used this technique to do just what my user wanted to do.  Your answer was the closest match to my posted question.  Thanks to everyone who responded originally.  I will also look into the software suggested.
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