one machine, two IP addresses?

[Ross Boylan <RossBoylan@stanfordalumni.org>]

I usually dial-up to my ISP and get an assigned IP address for the session.
I am thinking of connecting my ethernet card to a network, so I might have 
two connections at once.

My understanding is that the IP address comes from the ethernet card 
(hmm... but then it couldn't be assigned in a local network, so probably 
this is wrong..).  At any rate, is there a problem with the machine doing 
both networks at once?

Thanks.