To put it another way: * Thick black border indicates which button would be pressed if you hit enter. This is the focused button, or the default button if no b

To put it another way: * Thick black border indicates which button would be pressed if you hit enter. This is the focused button, or the default button if no button currently has focus. * Dashed border indicates which button or other control currently has focus; this button is pressed if you hit space (but if another control has focus then space does not press the default button).