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Borders may be directly drawn by the application by calling the function

    void DrawBorder( struct RastPort *rp, struct Border *border,
                     long leftOffset, long topOffset );

The rp argument is a pointer to the RastPort into which the border should
be drawn.  This rastport may come from a Window or Screen structure.

The border argument is a pointer to a list of Border structures which are
to be rendered.  The list may contain a single Border structure.

The leftOffset and topOffset arguments are the external component, or base
position, for this list of Borders.  The LeftEdge and TopEdge values of
each Border structure are added to these to determine the Border position.

Borders may also be indirectly drawn by attaching them to gadgets, menus
or requesters.

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