Actually, the correct name for them IS radio buttons (fun name, huh?). You can use them in two ways. One, as members of an option group (they usually are - as referenced by DJN above) and in an option group you can only select one at a time. So, if you click on one, another that is selected will unselect. This is the STANDARD programming use of radio buttons.
However, that being said, you can choose to use them in a situation where checkboxes would normally be used (i.e. to select more than one option). If you use them in this way, you will not be able to use the Option Group wizard and you just add an individual radio button and then can copy and paste as many as you'd like. You'll have to name or keep track of the names of each and use them accordingly in your code.
BL
hth