Hemlock binds system:*beep-function* to this function to beep the device.
It is different for different devices.
Bell Style determines what hemlock-beep does in Hemlock under CLX.
Acceptable values are :border-flash, :feep,
:border-flash-and-feep, :flash, :flash-and-feep, and nil (do
nothing).
Beep Border Width is the width in pixels of the border flashed by border flash beep styles.