Well, to share an internet connection between two computers is rather easy if that's what you're looking for in a hotel room. I know on my mac I can forward my internet connection through an extra ethernet card, wireless card, or bluetooth dongle. So you could just set up a bluetooth dongle at the hotel room and set up passwords, and the girlfriend/wife/mistress is all set up to get on the internet.

It seems a lot easier than messing with software, especially since you obviously have two laptops already, and another monitor and keyboard take up roughly the same amount of space.

Cheers,
Rich