SOLUTION to hw4 (v22.0201, Machine Org I, Fall 1997)

	by Paul Pignataro, Daniel Kifer and Saad Ahmed.
	with further modifications be Chee

1) They did a nice extra: to write the screen
	into a file:

        F3 causes screen to be saved 

2) I added mouse functions:
	init_mse	-- initialize mouse
	mov_2_mse	-- set the text cursor to current
				mouse cursor position
	Function F4	-- invokes mov_2_mse
