FT_REVCHR()
 Reverse the color of a single character on the screen
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 Syntax

      FT_REVCHR( <nTRow>, <nLCol> ) -> NIL

 Arguments

     <nTRow>, <nLCol> are the screen coordinates of the character.

 Returns

     NIL

 Description

     This is a high speed function to reverse the color of a single
     character on the screen without changing the character itself.
     This function is the same as FT_REVATTR() except that it changes
     only one character on screen and hence is faster and uses less memory.

 Examples

     FT_REVCHR( 10, 20 )

     This example will change the text and background at 10, 20 to it's
     reverse color attributes without changing or overwriting the
     character itself.

 Source: VIDEO1.C

 Author: Robert A. DiFalco