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  GETATTRBG()                                                 Video Function
 Purpose..: Grab the screen location background color number
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 Syntax...: GetAttrBG( <nRow>, <nCol> ) --> nClrBack

 Arguments: <nRow>     = row on the screen.
            <nCol>     = column on the screen.

 Returns..: nClrBack is the integer representing a color attribute.
            The integer formula is ...( nBack * 16 )

 Remark...: It is a high speed function used to pick off the
            background color attribute at the given co-ordinates.
            It does not change Clipper's color settings.

 Source...: VIDREAD.C
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 Example..: The example will grab the background of a point
            of the screen. Like all of these functions, it uses direct
            video writes for speed.

                nClrBehind := GetAttrBG( 7, 2 )