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ScreenUpdate
============

Syntax
------

     #include <pc.h>
     
     void  ScreenUpdate(void *buf);

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

This function writes the contents of the buffer BUF to the primary
screen.  The buffer should contain an exact replica of the video memory,
including the characters and their attributes.

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

None.

Example
-------

     ScreenUpdate(saved_screen);