Enable or Disable Close Command 

Enables or disables the Close command in the system menu.

mov ah, 16h    ; Windows multiplex function

mov al, 8Fh    ; VM Close

mov dh, 0      ; Enable or Disable Close Command

mov dl, Flags  ; see below

int 2Fh

or ax, ax

jz success

Parameters

Flags

Close flags. This parameter can be one of these values:

Return Value

Returns zero in the AX register if successful.