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 Function to display a shadow around a box
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 Syntax

        GT_Shadow(<nTop>,<nLeft>,<nBottom>,<nRight>) -> lSuccess

 Arguments:

      <nTop>,<nLeft>,<nBottom> and <nRight> are the
      co-ordinates of the box. The shadow will be drawn
      two spaces below and to the right.

 Returns:

      GT_Shadow() returns logical success.

 Description:

      Function to display a shadow to the bottom and
      right of a box.

 Examples:

      GT_Shadow(10,05,15,20)

 Source: GT_SHADO.PRG

 Author:  Martin Bryant