can 2 internet exist at same time on 8.10?

[sofian sindhi]

Dear all:
I use ubuntu 8.10 and it is really nice when I connect to wire or usb modem,
since it can automatically do the network setting.
But I have one question:
Can I both have 2 networks, wired and usb modem at same time?
Such that I can treat my ubuntu 8.10 as a server.
Normally I use ssh to connect to it and if I find I need to  update some
package I can apt-get directly whithout unplugin the usb modem.
Thanks for your help,
sofian
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