The BTT HTML widget is similar to the HTML Web widget in 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 you want to add services based on BTT HTML channel, you can choose the BTT HTML widget:
<input type="hidden" id="sessionId" value="<%=utb.getSessionId()%>"/>
The sample services, Transfer and Credit Card in the Web 1.0 Transaction, which are based on BTT HTML channel, are examples of BTT HTML widget.