The BTT HTML widget is similar to the HTML Web widget, from the structure to the usage. The difference is that BTT HTML widget is designed for the integration with the BTT HTML channel, while the other is for the general use. So if the users want to add services based on BTT HTML channel, they are supposed to choose this one.
<input type="hidden" id="sessionId" value="<%=utb.getSessionId()%>"/>
The sample services, Transfer and Credit Card in the Web1.0 Transaction, which are based on BTT HTML channel, are examples of BTT HTML widget.