The purpose of this dialog box is to select an access method for Dreamweaver to access your testing server.
Dreamweaver works with a testing server to generate and display dynamic content while you work. The testing server can be your local computer, a development server, a staging server, or a production server. As long as the server can process the kind of dynamic pages you plan to develop, the choice doesn’t matter.
For this access method, you must have a server that supports this protocol, such as Microsoft Internet Information Server (IIS) 5.0 or an appropriately configured installation of Apache web server.