The IIS Tools section offers several tools that control important aspects of your site.
This tool is used to disable HTTP (web browser) access to your site. Stopping the site here will cause a "Web Page Unavailable" page to be displayed when someone visits your site.
Note that the "Web Page Unavailable" page will only be displayed when you visit http://YourHostedDomainName.com. If you visit a subdirectory (such as http://YourHostedDomainName.com/app/) you will see a generic IIS 404 error.
Stopping the site with this tool does not affect email or FTP access, only HTTP access.