CentOS 7.0 - man page for curs_beep (centos section 3X)
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beep, flash - curses bell and screen flash routines
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 audi-
ble alert (bell or beep), but only some can flash the screen.
These routines return OK if they succeed in beeping or flashing, ERR otherwise.
SVr4's beep and flash routines always returned OK, so it was not possible to tell when the
beep or flash failed.
These functions are described in the XSI Curses standard, Issue 4. Like SVr4, it speci-
fies that they always return OK.
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