twSay( nRow, nCol, cString, cAttr, _wPicture )
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     Display a string on the screen at relative window coordinates
     nRow,nCol in a specified colour or the current window colour in
     the active window.

       Arguments:

     nRow,nCol   - 'N' Relative Window Coordinates.  Both default to 1.

     cString     - 'C' String to be displayed.

     cAttr       - 'C' Clipper colour attribute. Defaults to text
                       colour for the current window.

     _wPicture   - 'C' Clipper Picture String

       Return:

     Current window handle.

       Example:

     twSay( 10, 20, ". Choose a border type.", "GR+/B" )

        Displays the string at relative window coordinates 10,20 in
        yellow/blue.

     twSay( 10, 20, ". Choose a border type." )

        Displays the string at relative window coordinates 10,20 in the
        current window colour.