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 Values

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.