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delete_edge ({direction})

     Usage: Deletes an edge of a TILED window (deleting a window),
            making the current window larger. The edge must border
            only two windows. Use only when no overlapping windows are
            on the screen. When a window is deleted, its window id
            becomes invalid.

Parameters: Direction .int. indicates which edge to delete:
                        0 = above
                        1 = right
                        2 = below
                        3 = left
            If omitted, the user is prompted for an arrow key.

   Returns: Greater than 0 for success, 0 or less for failure.