The Amiga has no internal speaker, so it flashes the background color of the specified screen as a signal. If the argument is NULL all screens will be flashed.
INPUTS
screen
The Screen that will be flashed. If NULL all screens will flash.
RESULT
EXAMPLE
SEE ALSO
NOTES
BUGS
INTERNALS
Hardware with a speaker should make an audible beep, too. Maybe even leave out the flashing on those architectures.