Auto Dialup

I have a machine running windows xp as my home gateway
server, i need to be able to connect this machine to the
web constantly and have a couple of problems, if i place
the dial up in the start up folder then there needs to be
a person logged in to initiate the dial up, i would like
to be able to force the machine to dial up BEFORE a user
logs in

has anyone done this or know if this is even possible

Kind Regards

Carl