its easy really. want to have an entire family on dial-up with just one bill?
step one. purchase 20 dollar a month subscription to MSN unlimited access dial up. This will include an MSN 9 cd which you will need. With the software installed, fill up your secondary account slots with new users. Make sure you pick 
say the secondary account is johnsmith@msn.com type in the Dial up connection
USER : MSN/johnsmith
PASS: ******* (whatever)
connect to your local msn phone number and the other people you gave secondary accounts to will be able to do the same, while you are connected. Its a sweet deal considering everyone is paying about 2 bucks a month for internet access, especially if you cannot get broadband. if you wanted to sell off the access to people you could actually make money doing this.. but i do not suggest it.
I used to be an msn tech and this was a little known secret even to most of the employees.
After you do this you do not need the software any more. I would suggest keeping it on to micromanage everyone else's accounts. and for the simple fact that if they don't pitch in, cut them off HEHEHE
i'm on broadband now so i dont care if i tell you my little secret. anyone else knew of this?