The Control method show-dialog will bring up a dialog with the options "yes" and "no". The arguments passed to the method will specify the dialog's title, its message, and text for both the "yes" and "no" buttons. The method returns 1 if the "yes" button is clicked, and 0 otherwise.

This method only produces a "true" dialog with the Mac OS X application. With the command line version of breve, this method will produce a message to standard output.