Radio buttons are similar to Check boxes. The difference is that when you specify a group of radio buttons, a page visitor can check only one of them, i.e. selecting only one of alternatives is available.
All buttons in a group of radio buttons must have the same Group Name. Each individual button must have a unique Member Value.
A Name and a Value of a form field will be sent to a corresponding CGI.
If you check the Selected member check box, a radio button will be displayed checked in a browser.
The Extra HTML button enables you to insert an extra HTML code into a current HTML tag. When you click on the button, the Extra HTML Tag Attributes dialog box is displayed where you can enter the extra tag attributes. You must be familiar with the HTML language to use this feature correctly.