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 _twExplode( nT, nL, nB, nR, nAttr, nFiller, nTLChar, nTChar,
                 nTRChar, nRChar, nBRChar, nBChar, nBLChar, nLChar )
 ----------------------------------------------------------------------------
     Display a region on the screen in a given colour with a given
     frame. This function is used by twOpen() and DOES NOT update the
     window stack. It simply clears a screen region and puts a frame
     around it. It is equivalent to:

              @ 5, 5, 15, 75 BOX "+-+|+-+|" in Clipper.

       Arguments:

     nT, nL
     nB, nR  - 'N' Screen coordinates.

     nAttr   - 'N' DOS Colour attribute.
     nFiller - 'N' ASCII Filler character number
     nTLChar --+
     nTChar    |
     nTRChar   |
     nRChar    |- 'N' ASCII Frame Character Numbers as for
     nBRChar   |      a Clipper box frame.
     nBChar    |
     nBLChar   |
     nLChar  --+

       Return:

     NIL

       Example:

     _twExplode( wT, wL, wB, wR, twVattr( twStdClr( wColor )),;
        ASC( wFill ),;
        IIF( wFType <> 0, ASC( SUBSTR( wFrame, 1, 1 )), NIL ),;
        IIF( wFType <> 0, ASC( SUBSTR( wFrame, 2, 1 )), NIL ),;
        IIF( wFType <> 0, ASC( SUBSTR( wFrame, 3, 1 )), NIL ),;
        IIF( wFType <> 0, ASC( SUBSTR( wFrame, 4, 1 )), NIL ),;
        IIF( wFType <> 0, ASC( SUBSTR( wFrame, 5, 1 )), NIL ),;
        IIF( wFType <> 0, ASC( SUBSTR( wFrame, 6, 1 )), NIL ),;
        IIF( wFType <> 0, ASC( SUBSTR( wFrame, 7, 1 )), NIL ),;
        IIF( wFType <> 0, ASC( SUBSTR( wFrame, 8, 1 )), NIL ) )