MOVE HELP
DEFINE CENTRE defines the centre for all rotation, reflection and 
expansion  functions at the current key cursor  position.  CENTRE 
POSITION reports this centre position and allows it to be edited. 
YAW  rotates  in  the plane of the  plan  (horizontally)  by  the 
current degree  of  rotation,   ROLL  rotates  in  the  plane  of  
frontal  elevation.    PITCH  rotates  in the plane  of   lateral  
elevation tumbling  towards  or away from  you.   The  reflection  
functions  reflect   the  image  about the  centre   in   similar  
manner.  MOVE records the current cursor position and asks you to 
move it to  a new position and offsets all points by that change.  

