Int 2F Fn 168F  - Windows95 - Close-awareness - Enable/disable Close Comm  [W]

   AX = 168Fh
   DH = 00h
   DL = new state
       00h disabled
       01h enabled

Return: AX = status
       0000h successful
       else failed
Desc:  enable or disable the system menu Close command for an application

See Also: AX=168Fh/DH=01h,AX=168Fh/DH=02h