What is the Jasperserver 6.3 Web UI Technology?

Hi,

 Does anybody knows what is the web ui technology shipped on Jasperserver 6.3? I read from 6.1 documentation that it uses Rich Client but I can't see anything related on 6.3 version:

https://community.jaspersoft.com/documentation/tibco-jaspersoft-studio-user-guide/v60/user-interface

 We are having some troubles in implementing SSO function with header variable and the SSO support are asking about the user interface technology.

Regards!