The Preferences dialog box's Preview in Browser category configures the list of web browsers available to preview and debug your Dreamweaver documents.
A list of the browsers configured to preview documents. The default browser, usually Internet Explorer or Netscape, is included in the list if it is present when Dreamweaver is installed. Use the plus (+) and minus (-) buttons to add and remove browsers from the list. Use the Edit button to specify the application path to a browser. You can specify more than two browsers, although only two are accessible via keyboard shortcuts.
Enable this checkbox for the browser you wish to be your secondary browser. Preview a web page in this browser by using File Preview in Browser, Alt+F12 (Windows), or Opt+F12 (Macintosh). Debug in this browser by using File Debug in Browser secondary , Ctrl+Alt+F12 (Windows), or Cmd+Opt+F12 (Macintosh).
Preview Using Local Server (Windows Only)
This option allows you to use your locally running web server to preview your documents. Using a local server allows you to preview documents with server-side scripts and elements included.