Open or activate a kriging window.
  Open or activate a membership function
           window.
  Open comment window.
  Open input weight window.
  Move the item.
  Moving the item
           (until mouse button released).
  
  Place the AND composition.
  
  Place the OR composition.
  
  Place the SUM composition.
  
  Place the start of a connection.
  
  Place the end of a connection.
  
  Delete composition or connection.