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(elisp)Beeping

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Beeping
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   This section describes how to make Emacs ring the bell (or blink the
screen) to attract the user's attention.  Be conservative about how
often you do this; frequent bells can become irritating.  Also be
careful not to use just beeping when signaling an error is more
appropriate.  (Note: Errors.)

 - Function: ding &optional do-not-terminate
     This function beeps, or flashes the screen (see `visible-bell'
     below).  It also terminates any keyboard macro currently executing
     unless DO-NOT-TERMINATE is non-`nil'.

 - Function: beep &optional do-not-terminate
     This is a synonym for `ding'.

 - User Option: visible-bell
     This variable determines whether Emacs should flash the screen to
     represent a bell.  Non-`nil' means yes, `nil' means no.  This is
     effective on a window system, and on a character-only terminal
     provided the terminal's Termcap entry defines the visible bell
     capability (`vb').

 - Variable: ring-bell-function
     If this is non-`nil', it specifies how Emacs should "ring the
     bell."  Its value should be a function of no arguments.  If this is
     non-`nil', it takes precedence over the `visible-bell' variable.