flash-window-on -- Flash WIN's titlebar and boundary color to COLOR indefinitely.
flash-window -- Flash WIN's titlebar and boundary color to COLOR for UNFLASH-DELAY seconds.
window-flashing? -- Return #t iff WIN is currently flashing, #f otherwise.
unflash-window -- Revert WIN's titlebar and boundary color to state before a flash-window.
stop-flashing-window -- Turn off window flashing of WIN.
raise-and-stop-flashing -- Turn off window flashing of WIN and raise it.