Stephanie
I recommend you look at
www.west-wind.com , specifically the classes to run SQL across an IP connection. This avoids the need to expose SQL Server to the internet.
I'm not sure how you'll get on with dynamic IP addresses... how will two computers know to communicate with each other at all, let alone via SQL? You'll need an intermediate server somewhere that provides DNS or similar so the machines know how to find each other.
Regards
j.R
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1