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How do companies like Starbucks pull this off?
This sort of stuff is manufactured by the likes of ZyXEL, D-Link and many others.
They work by allowing anyone to get a wireless connection which shows them a default page which then allows access to the 'net after they've entered a passowrd, paid money etc.
You probably also need a box which will do SMTP redirection so they can send email out through it as well.