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ScreenVisualBell
================

Syntax
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     #include <pc.h>
     
     void  ScreenVisualBell(void);

Description
-----------

This function flashes the screen colors to produce the effect of "visual
bell'.  It does so by momentarily inverting the colors of every
character on the screen.

Return Value
------------

None.

Example
-------

     ScreenVisualBell();