Radio buttons are similar to menu buttons. Use them when you want users to select one of several options. Check boxes can be used in groups or individually.
Use the same field name for all the buttons that you group together. Usually, you need to specify a unique field name. Radio buttons are the exception to this rule.
This name does not appear on the form; it's stored in the HTML file. The cgi-bin script uses this name to identify the information collected from that field.
A red check mark indicates it's selected.
For instance, you may ask people to indicate whether they prefer the color purple or orange. Instead of returning "purple" or "orange," you return "p" or "o." This step is optional.