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 twFrame( wFType, wFColor, wHndl, lTitles )
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     Redraw the frame of the currently active window. The window stack
     is modified by replacing the old frame type with the new one. The
     frame color is updated as well. If the current frame colour is an
     array, the new colour becomes element 1 of that array.

       Arguments:

     wFType  - 'N' Frame Number. Designates the type of frame to be
                   drawn from the following list:

                         Window and Box Borders

                  "+-+|+-+|"      1 - single line box
                  "+-+|+-+|"      2 - double line box
                  "+-+|+-+|"      3 - t-single double
                  "+-+|+-+|"      4 - t-double single
                  "+-+|+-+|"      5 - 1-double single
                  "+-+|+-+|"      6 - 3-double single
                  "+-+|+-+|"      7 - 7-double single
                  "+-+|+-+|"      8 - 9-double single
                  "########"      9 - thick solid
                  "########"     10 - thin solid
                  "########"     11 - shaded light
                  "########"     12 - shaded medium
                  "########"     13 - shaded heavy
                  "        "     14 - spaces

               This parameter defaults to 0.

     wFColor - 'C' Clipper Colour Attribute. Defaults to the current
                   frame colour. If the frame colour is an array, it
                   defaults to the first element.

     wHndl   - 'N' Handle of window on which to perform the action.
                   Defaults to the current handle.

     lTitles - 'L' Logical to repaint titles array.

       Return:

     Current Window Handle

       Example:

     twFrame( 6, "gr+/r" )