INT 2F - AD-DOS - UNBLANK MONITOR                                               
	AX = C009h
Return: AL = 00h if successful
Program: AD-DOS is the DOS version of the After Dark screen blanker for
	  MS Windows
Range:	AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Note:	this function works by simulating keyboard activity
Index:	screen saver;AD-DOS