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 (see Errors).
This variable determines whether Emacs should flash the screen to represent a bell. Non-
nilmeans no. This is effective on graphical displays, and on text terminals provided the terminal's Termcap entry defines the visible bell capability (‘vb’).