KEY-IN allows you to define a plane by assigning a
concatenated series of rotations.

Specify a rotation order by choosing from the following:
  
TOP IN
TOP OUT
RGT IN
RGT OUT
CW (clockwise)
CCW (counterclockwise)
DONE

For each choice made from this menu, you are prompted to
enter a rotation angle. Enter a positive rotation angle for
the desired direction and press <Enter>.

After specifying the desired rotations, choose DONE.
