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 Line             Draws a line.
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 Syntax:          <oPrn>:Line( <nTop>, <nLeft>, <nBottom>, <nRight>, <oPen> )
                                 -->  <lSuccess>

 Parameters:

 <nTop>           The coordinates of the line to draw. By default they are
 <nLeft>          expressed in pixels, unless a different SetMapMode() mode
 <nBottom>        is selected.
 <nRight>

 <oPen>           It is an optional pen object to use for painting the box.
                  To create it use:

                  DEFINE PEN oPen STYLE ... COLOR ... WIDTH ...

 Returns:         A logical value indicating if the operation was
                  successfully performed.