Loading external data into dreamweaver

Usually I’m making sites in Flash and can grasp the use of loading external content just using text files. But now I’m making an html site for a client.
The layout I’m making in fireworks then slicing editable regions for text so I can type it in dreamweaver. What I want to know is would my client be able to update one of these editable regions easily. I’m looking into XML and PHP but really can’t grasp what would work in this particular situation.
Any insight at all is greatly appreciated while I keep working on my solution.
Thanks