Int 2F Fn A903  - Metztsr.com - Get Metz Ctrl-alt-del Flag                 [U]

   AX = A903h
   CF set

Return: CF clear if successful
       AX = 97FFh if Ctrl-Alt-Del allowed
       AX = 0000h if Ctrl-Alt-Del not allowed
   CF set if not resident

See Also: AX=A902h