Plesk for Windows uses the IIS HTTP Server (http://www.iis.net/) for
hosting and managing websites.
Default Web Server Configuration
The default IIS configuration is defined by the hosting provider using
IIS tools such as IIS Manager. The default configuration is applied to
all websites on the server. However, a number of configuration
parameters can be changed for individual websites right in the Plesk UI.
Custom Web Server Configuration
Website owners may need custom web server capabilities that are not
provided by the default configuration. For example, unusual types of
index files or the restricted access to the site by IP address.
You or site owners can configure web server settings for a website by
specifying IIS settings in the Customer Panel. The custom website
configuration overrides the default configuration. For details about
custom IIS configuration, see Adjusting IIS Settings for
Websites.
with