My modem is a Motorola unit (cable modem). Why do you ask? 
Well my modem has no administrative program to setup
a network, with passwords and so forth. It has 4 ethernet
connections, and is supposed to be able to do as many
wifi connections as a home network also. But, it only works
with Open WEP and the modem key. I've never tried
more than one connection for wifi at the same time. I assume
it would work up to 4 wifi connections at the same time with
Open WEP and the key only. I thought your modem might
have the luxury of an administrative program where I could
use WPA, passwords, or other administrative monitoring,
usage logs, sharing, and so forth for a wifi network if I was the
administrator of the network.
Thanks for the response.
FF