Property "HTML Name" <htmlname>

To ensure that only one radio button can be selected, group all buttons in a list and attain the same HTML Name to all through the HTML Name property.

In the figure above, 3 radio buttons are grouped together and all have "AGE" typed into the HTML Name property.

The values are  "0-17", "18-39" and "40-"

When the user selects "18-39" in browser, the HTML  Name "AGE"  will be sent to server with a value of "18-39".