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  Name:     m_csroff() - turn mouse cursor off
  Usage:    m_csroff()
  Params:   none
  Returns:  nothing

 ---------------------------------- Example ---------------------------------

                 m_csron()
                 m_inbutton()
                 m_csroff()
                 save screen to temp
                 m_csron()

  Caution:  You should always shut the mouse cursor off before
            updating or modifying the screen since the mouse cursor
            will be overwritten by the new item being displayed. The
            mouse cursor always saves the contents of the screen
            underneath the mouse cursor. When the mouse cursor is
            moved, the original contents underneath the cursor are
            restored. If you overwrite the mouse cursor with something
            new, the mouse driver will dutifully restore the old contents
            of the screen over the new item you just displayed. The best
            defense against this is to turn the mouse cursor on only
            when you need it, and keep it off at all other times.