On Windows-based installations, you can secure access to a site with SSL for site owners without having them purchase their own SSL certificate. Websites that employ shared SSL are, in fact, using the certificate shared by another domain. The domain that shares its SSL certificate with others is called master SSL domain.
You can pick any website that belongs to you, switch on SSL support in web hosting settings, install a valid SSL certificate on that site, and make it act as a master SSL domain for all other websites hosted on the server. Or you can pick a website that belongs to one of your users (reseller or customer account), switch on SSL support in web hosting settings, install a valid SSL certificate on that site, and make it act as a master SSL domain for all websites of this user.
Once the master SSL domain is assigned, you or your customers need to add shared SSL links for each website that needs secure access.
To configure the master SSL domain and enable shared SSL on your server:
For information about adding shared SSL links for websites, refer to Control Panel User's Guide, section Using SSL Certificate Shared by Another Website.
To disable shared SSL on your server: