Acknowledge Close 

Acknowledges the close state of the internal close flag.

mov ah, 16h    ; Windows multiplex function

mov al, 8Fh    ; VM Close

mov dh, 2      ; Acknowledge Close

mov dl, 0      ; always 0

int 2Fh

or ax, ax

jz success

Return Value

Returns zero in the AX register if successful.

Remarks

Acknowledging the close state is necessary if an application needs to perform additional keyboard input before exiting. If the close state has been signaled but not yet acknowledged by an application, all keyboard read operations will return NULL and buffered line input will return an empty string.