The beep and flash routines are used to alert the terminal user.
The routine beep sounds an audible alarm on the terminal, if
possible; otherwise it flashes the screen (visible bell). The
routine flash flashes the screen, and if that is not possible,
sounds the alert. If neither alert is possible, nothing happens.
Nearly all terminals have an audible alert (bell or beep), but
only some can flash the screen.
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