Dreamweaver MX Templates - Questions and Answers
Editing a template and updating pages:
When you edit a template, you can choose to apply the changes to all pages that use that template. For example, to change the logo graphic for your site on all the pages in the site, change the graphic in the template and direct Dreamweaver to update the pages in the site that use the template.
For most changes, editing a template is like editing
any page in a site. You add, delete, or modify the content
of the template. Editing a template differs from editing
other pages because you can define new editable regions,
or lock editable regions.