[Option] /sites:;;; ;… [Description] 
This option enables the mapping of the content located in physical directories to the virtual directories of the web site. Each Site, Virtual Directory, and Virtual Application element is appended in order they are defined to create the virtual paths (also called a location path in the web.config location element). VirtualPath1 maps to the site name of as defined by the name attribute of the element in the service definition file. PhysicalPath1 is the location of the Site contents.