Dreamweaver Templates - Editable & locked regions
A template has two types of regions: editable and locked (noneditable). Editable regions are the sections of a template that have changing content, such as an article in a newsletter. Locked regions are the sections of a template that have static, unchanging content, such as a corporate logo or a standard site navigation bar.
When you edit a template (a .dwt file), you can make changes to both the editable and locked regions. You can also create new editable regions, or lock editable regions. The editable and locked regions are highlighted in the template. By default, editable regions are highlighted in blue and locked regions are highlighted in yellow. You can change the highlight colors in Dreamweaver Highlighting Preferences.
When you edit a document that has a template applied to it (an .htm file), you can make changes to the editable regions only. The locked regions are highlighted, indicating that you cannot change these areas