The original intention of this invention is using PC mouse as a pointing device for the then IBM mainframe. It was exhibited and demonstrated during the Fall Comdex in Las Vegas, 1968.
Lin Hsin Hsin met Dr Engelbart in 2003. As she shook hand with this frail 78-year old computer scientist, she thanked him for the invention, and told him that she had use the mouse extensively over and beyond its purpose-built functions, i.e. drag & drop, point & click, since 1994!