I am not at my work computer, so I can't give you exact information at the moment.
I can tell you that Cimplicity HMI has a built-in option to create web pages automatically. Look in your help file for "WebView".
WebView lets you set up your HMI server as a web server for your Cimplicity screens. There are some elements that are not suited for display in a browser, such as scripts.
Depending on what version you have, you may have to purchase additional licensing. You can also purchase additional licensing to allow more people to be able to view at once.
You can also find more information on the GE support website (support.gefanuc.com). There is a link to the GE forums at the top of the page as well.