Anyone know about multihoming with DSL Modem and NIC?

[FearCourage 0]

I have an intel pro dsl 2100 and a 3com 3c905tx. They are in a dual pIII600 mobo. There are no conflicts. I am running windows 2000 advanced server and windows xp pro. The xp pro machine has the nic and dsl card. If I set the NIC's default gateway to the IP of the DSL nic, will I still be able to get to the internet using a domain account?