I'm not sure of an answer for your question but I just think you should be aware Windows XP Pro is limited to 10 concurrent network connections and that is hard coded into the OS by Microsoft. Home is limited to 5 concurrent connections. Vista has the same limitation (EDIT: As XP Pro). So depending on how many connections you are looking at, this may not be a solution for your needs. I only add this since you asked about permissions so I can only assume you'll have multiple people accessing this resource.
