FT_REVATTR()
 Reverse colors of specified screen coordinates
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 Syntax

      FT_REVATTR( <nTRow>, <nLCol>, <nBRow>, <nRCol> ) -> NIL

 Arguments

     <nTRow>, <nLCol>, <nBRow>, and <nRCol> are the coordinates of the
     screen region.

 Returns

     NIL

 Description

     This is a high speed function to reverse the color of a specified
     screen region without disturbing any text on the screen.  This
     function will correctly reverse the color attributes in a region
     containing multiple color combinations.

 Examples

     FT_REVATTR( 0, 0, MaxRow(), MaxCol() )

     This example will change the entire screen's colors to their reverse
     attributes without changing  or overwriting any text.

 Source: VIDEO1.C

 Author: Robert A. DiFalco