Cancels the close operation.
mov ah, 16h ; Windows multiplex function
mov al, 8Fh ; VM Close
mov dh, 3 ; Cancel Close
mov dl, 0 ; always 0
int 2Fh
or ax, ax
jz success
Returns zero in the AX register if successful.
After acknowledging the close state of the internal close flag, an application should either exit or cancel the close operation by calling Cancel Close.