I have set up a few home networks for friends/family but always with a broadband connection that did not need a login. A friend now wants me to set him up but he's using SBC/Yahoo DSL and it requires a login. Does anyone know if this will impact the way the setup works? I mean, if he has to log in initially, what happens when computer #2 wants to connect and #1 is already logged in? Wouldn't the login show that the account was already connected? Or am I overthinking this and I should just plug everything and fire it all up?

Thanks in advance.