On Mac OS X, by default you cannot use the
Tab
key to move the focus from one dialog button to another. You can fix this by selecting
Apple Menu > System Preferences... Keyboard & Mouse > Keyboard Shortcuts > Full keyboard access:
>
All controls
This setting makes
Tab
switch between the buttons and also
Space
will select the
Yes
button in a dialog by default.
LispWorks IDE User Guide (Macintosh version) - 25 Nov 2011