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Bell
====

   Here we describe commands to make the terminal ask for the user to
pay attention to it.

`bl'
     String of commands to cause the terminal to make an audible sound.
     If this capability is absent, the terminal has no way to make a
     suitable sound.

`vb'
     String of commands to cause the screen to flash to attract
     attention ("visible bell").  If this capability is absent, the
     terminal has no way to do such a thing.