Radio Buttons

[Jason McAfee <jamcafee olemiss edu>]

I hope this doesn't sound like a dumb question, but I am new to gtk
development.  

In my program, I have a group of radio buttons, and I also have a button
on the form as well.  When the user selects the button I want to go to a
new window but I want to remember what radio button was checked in the
group.  How do I do this?  Is there a  way to tell what radio button has
been selected in a group?

Thanks