INT 2F - METZTSR.COM - SET METZ Ctrl-Alt-Del FLAG

	AX = A902h
	BL = new value
	    00h Ctrl-Alt-Del not allowed
	    else Ctrl-Alt-Del allowed (startup default is 01h)
	CF set
Return: CF clear if successful
	    AX = 97FFh
	CF set if not resident
SeeAlso: AX=A903h