Users can integrate HTML into a custom panel, either by launching an HTML page through an action command, or by embedding the page into the panel. In addition, UNE allows a limited set of HTML to be directly injected to the page.
HTML pages must be hosted separately. The page can be launched using HTML GET or POST parameters. In addition, a pipe protocol has been added, which allows two-way communication between UNE for ArcGIS and the launched page.