Expects: AX    0002H
Returns: none
Info: This removes the mouse pointer from the screen (if it is
currently visible).  It actually decrements an internal pointer-
display cursor.  If that counter is 0 before the call, the mouse
pointer is removed from the screen.

Use this function before performing any direct writes to the
video display (if doing so will overwrite the mouse pointer) and
call INT 33H 0001H (show ptr) after writing to the screen.  See
the discussion of Mouse Droppings under INT 33H.

- -

INT 33H 0002H: Hide Mouse Pointer