Yes and No. Most consumer broadband connections are DHCP connections and after a certain amount of time the broadband modem will renew its lease and this may or may not be the same IP address. Also, of ISP's block requests directed at port 80 coming over their connections and this is as simple as chaning the port IIS listens on.
If you have a router between your PC and modem, you will need to setup port forwarding so that when a request comes in on port 80 the request is directed to your pc.
Lastly, in most TOS contracts with ISP's (unless you specifically bought business class service that states you can host) you agree not to host a website off of your connection.
Lastly IIS that comes with Windows XP Pro only supports 10 concurrent connections.
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I will only tell you how to do it, not do it for you.
Unless, of course, you want to hire me to do work for you.
^^Thats my signature
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