Hi Richard,
See below code for a toggle button which is linked to MB100:
<form method="GET" action="/">
<input type="hidden" name="/Web/Start.htm" value="1"><input type="submit" value="[MB100,OFF,ON]" name="M1"><input type="hidden" name="Data10" size="5" value="[MB100,1,0]"></form></td>
<td align="center" width="200">
<form method="GET" action="/">
Please make sure to put in the data table addresses in index 10 the value MB100.