Web servers created using the CICS Web Interface (CWI) feature of Enterprise Server can be configured to use the Secure Sockets Layer (SSL) for communications security. Along with enabling SSL, you can specify the CLIENTAUTH option to allow clients to send user certificates to the server, and one of the various AUTHENTICATE options to tell CWI how to handle user authentication. If you specify CLIENTAUTH and one of the CERTIFICATE, AUTOREGISTER or AUTOMATIC options, your CWI server will use the Enterprise Server user certificate registration mechanism. This section explains user certificate registration and what you can do with it.