Jun,1,1992  Version 1.00
	First versin released.
Jul,1,1992  Version 1.01
	Some bugs fixed.
Oct,30,1993  Version 1.1
	Bug fixed. Control and Context routine was changed.
Mar,2,1994  Version 1.2
        Refine some messages.
May,10,1994  Version 1.3
	Bug fixed. 
