Proper security safeguards on your Web server can reduce or eliminate various security threats from malicious individuals, as well as from well-intentioned users who might accidentally gain access to restricted information or inadvertently alter important files.
Upon site creation, HC sets appropriate permissions on IIS folders. When a IIS site is created, HC creates an anonymous user accounts for the site. For example if you have created a site www.mydomain.com, then its anonymous user will be mydomain.com_web. This user has only read rights on the site.