Gives an audible or visual signal to the user.
alarm()
No useful value is returned.
alarm() works by sending a "\a" character to the console. On most platforms this will ring a bell, beep, or give some other signal to the user (unless standard output has been redirected).
"\a"
It attempts to flush the console (see flush.console).
flush.console
# NOT RUN { alarm() # }
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